The “predatory publisher” category raises more questions than answers. Just like “academic fraud”, it tends to validate a black & white world in which rules and norms are clear-cut and universally shared through time, disciplines and countries. There is now an extensive literature presenting lists, criteria and even automatic detection for such publishers or their journals, most of it being written without questioning the label “predatory”1. More interestingly, there are a few papers describing the point of view of authors publishing in such vilified outputs, showing both the deceptions performed by the publisher and the good faith of most authors2.
Such results could be downplayed on the grounds of the authors’ peripheral position or the low power of the studies. On the opposite, everyday stories show that separating the wheat from the chaff is rather complex because a huge and diverse “grey zone” exists, even for scholars well versed in the arcane of publishing. This post aims to describe such an example by making the story personal rather than abstract, using testimonies, personal opinions and statements. In this world, the choice to review, write or edit for a given journal or publisher remains tricky, based on existing alternatives, personal ethics and situated decisions
“You are invited”: a not-so-classical email
It has become an almost daily ritual: an invitation to present at a conference, to submit a manuscript to a journal, or even to join an editorial committee, sent by people you don’t know, with a vague personalized message through your name and the reproduction of the title of an article you’ve written, with zero relevance to the issuing conference or journal. On August, 9th 2023, I received one of these messages, entitled: “[Publications] (ISSN 2304-6775) Invitation to Serve as an Editorial Board Member”. It caught my attention for three reasons: firstly, it’s that time of the year with the lowest e-mail volume; secondly, there was an apparent MDPI account in the copy of the mailing; and thirdly, I know this journal, some of its articles I found relevant or even enlightning, and others cite some of my work (which is not a sign of quality but could explain this invitation). So let’s read it again:
We would like to invite you to join the Editorial Board of Publications (ISSN 2304-6775, https://www.mdpi.com/journal/publications). Publications is open access and peer-reviewed, covering all aspects of scholarly publishing and communication. You can find the proposed scope of the journal here: https://www.mdpi.com/journal/publications/about/.
Publications is abstracted and indexed by Scopus, ESCI, DOAJ.
This presentation is not typical of « predatory » emails that begin by flattering the recipient of the message, emphasising the importance of their work and what they can contribute to the journal, and at the same time inviting them to join the editorial board and submit a manuscript.
Editorial Board Members will be responsible for final decisions on manuscripts in their field of expertise and may be invited to review manuscripts. The initial term lasts for 2 years, and entails:
• Pre-screening and making decisions on new submissions related to your research interests;
• Providing input or feedback regarding journal policies;
• Helping to promote the journal among your peers or at conferences;
• Attending Board Meetings to suggest journal development strategies;
• Reviewing manuscripts.
• Helping to attract suitable expert authors.
The job description for editorial board members is typical of a journal owned by a commercial publisher: in a nutshell, you run the journal, you promote it without being the decision-maker on its policies and, obviously, without compensation except in what many colleagues name a prestige economy.3
Some consider this an intolerable exploitation of the scientific community, and petitions have regularly called for people to refuse to accept these positions, the most famous remaining The Cost of Knowledge. Others are comfortable with it, believing, for example, that the division between the scientific work carried out by the committee members and the publisher’s production and distribution tasks is a good compromise4
If you accept our invitation, please provide your contact information and a list of keywords reflecting your expertise, in accordance with the entry examples at https://www.mdpi.com/journal/publications/editors/. If possible, please also send, for our records, a CV or an official website with your biographical data (including a list of your publications). If this is of interest, but comes at an inopportune time, you may have a recommendation for a senior expert to serve as an Editorial Board member. If you have any questions, suggestions or recommendations, please let us know.
This detailed procedure is another hint to add in the direction of a genuine invitation for a position in the committee of a standard commercial publisher journal, which is rarely considered as a “grey zone” output. Nevertheless, there is another surprising piece of information about the ‘benefits attached to the position of editorial board member. I don’t know if it is a standard practice in APC-based journals5. Yet this three-line paragraph looks extremely problematic to me for three cumulative reasons. Once again, others could consider it completely benign, due to shared ethics and practices, which would prevent everything that follows.
Additionally, you are welcome to publish with the journal—this will be free of charge once accepted for publication. The term for the Editorial Board membership lasts for two years and can be renewed.
Firstly, it encourages members of the editorial committee to publish in their journal, which puts them in a conflict of interest, even if they do not manage the fate of their manuscript. Secondly, this incentive is redoubled in monetary terms, since APCs are waved, an ‘APC ring’6 between an editorial board member and authors who can not or do not wish to pay an APC that invites them in the byline, is favored. Finally, this policy for editorial board members is not public, unlike the ‘discounting’ policy for timely reviewers detailed on the MDPI Publications website.
This paragraph alone could have made me cringe and refuse the invitation. But it also comes from a publisher which is piling up 50 shades of grey stories.
MDPI: From independence to “grey policies”
At the end of the last century, a Chinese chemist woking in Switzerland invented a preservation practice: to deposit a sample of compounds associated with an article, and to do so confounded the la Molecular Diversity Preservation International (MDPI). He then created a journal, Molecules, published by Springer, taking the position of editor-in-chief and explained his aim:
“The comprehensive chemical data obtained from a research topic will be presented in Molecules, and the chemical samples of the related molecules will be submitted, where
possible, to an MDPI center and so be made available to the public. This procedure will make a chemist’s intellectual contribution even more worthwhile.”7
Soon, the relationship with the publisher turned sour, and the chemist, Sun-Kun Lin, decided to add to MDPI operations the publication of a journal entitled… Molecules. Springer threatened to sue him claiming it owned the title but finally did not. The lone rebel quickly developed a successful business formula, sometimes labelled “low-cost full open access journals”. It was a striking example of the “new journals” that the open access activists pushed for in the BOAI. Later, MDPI was rebranded MultiDisciplinary Publishing Initiative, became one of the top 5 academic publishers as far as volume is concerned, with most journal titles being as generic as possible from Acoustics to Youth, passing by Genes, Physics, Societies and Software. So, the initial declaration of indépendance made by one academic grew into a worldwide success story, but went along with dubious reputation and negative narratives.
Let’s give a few examples of these stories. A neurosurgeon received a request for an assessment from the Journal of Clinical Medicine and responded with a very negative assessment within 2 days. In his view, there were major methodological problems preventing publication, in particular discrepancies between the protocol described and the reality of the clinical trial. Two days after sending his review, he received a request for the revised article. This new manuscript was very different from the first:
“The manuscript had indeed undergone extensive revisions. The biggest change, however, was also the biggest red flag. Without any explanation the study had lost almost 20% of its participants. An additional problem was that all the issues I had raised in my previous review report remained unaddressed. I sent my newly written feedback report the same day, exactly one week after my initial rejection.”8
Despite these problems, two other reviewers accepted the manuscript, while another colleague agreed to reject it, ‘forcing’ the editor-in-chief to refuse publication. But the story doesn’t end there, because the same manuscript reappeared in another MDPI journal, Geriatrics… in a version very similar to the first manuscript submitted. The reviewer contacted the editor-in-chief, shared his experience and the manuscript was ‘withdrawn’ in agreement with the authors. But like a B-movie with undead enemies who never disappear, the manuscript was eventually published in a third MDPI journal, Medicina. This story is typical of the grey zone: authors willing to do anything to get published, complacent reviewers, a system of manuscript transfer to ‘optimise’ publication, but also honest reviewers and editors willing to listen even when they want to reject.
Let’s turn now to the employees of MDPI, those who maintain the supply chain publication. In Bucharest, a young employee died of a heart attack on MDPI’s premises, and the local media questioned the employer’s responsibility in dealing with the health emergency and, more broadly, working conditions. As in other capital-intensive production facilities, journal editors are partly judged and rewarded on the basis of quantitative indicators. Not only does the APC-based model generate income only if the manuscript is accepted, but the workers are directly incentivised by this ‘success’:
“Editors get one performance point for every published manuscript they handle, but only half of a point for rejecting a manuscript. Staffers who reach a certain number of points get a monthly bonus.”9.
This production culture, which combines speed and pressure, is felt by both editors and reviewers. It is always in this form of experience and testimony that colleagues react, in a ‘me too’ frame. This often leads them to break off all relations with the publisher, its journals and its editors, despite frequent reminders by e-mail:

These experiences happen within the frame of “normal” journals, but there is an elephant in the room: MDPI developed/invented the concept of multiple special issues happening at the same time for any given journal. As a social scientist, I normally enjoy special issues on my topics of interest and cherish a well-crafted collection of papers which, ideally, discuss with one another. For example “Women in Chemistry Science” seems like a very interesting topic for the already cited Molecules. But MDPI twisted this nice idea making the traditional “special issue” another grey object.
The special issue dilemma
I said at the beginning of this post that I would give priority to a situated view, to experience rather than objective data. But for those of you who don’t know, here were the figures for MDPI on the importance of special issues:

This figure is extracted from a very informative blog post by Paolo Crosetto, written almost 4 years ago, and entitled “Is MDPI a predatory publisher?” in which the author answers “yes and no”.
“So, is MDPI predatory or not? I think it has elements of both. I would name their methods aggressive rent extracting, rather than predatory. And I also think that their current methods & growth rate are likely to make them shift towards more predatory over time. MDPI publishes good papers in good journals, but it also employs some strategies that are proper to predatory publishers. I think that the success of MDPI in recent years is due to the creative combination of these two apparently contradicting strategies.”10
“
That very fine post was heavily commented on the data, its interpretation, showing very contrasted views to answer on the nature of MDPI publishing. Furthermore, by the end of 2021, the number of special issues had exploded, with some journals publishing more than one a day. On the producer side, we now know that the special issue system has a similar “point system” that pushes MDPI employees to publish more. But how do we explain this success on authors side? In my opinion, it is a perfect combination of what at first sight might not seem to be so: the close relationships of small groups of colleagues sharing peculiar interests and a large-scale industrial production model. Again, let’s be concrete and talk about my own experience. After not responding to the invitation to join the editorial board, I received an invitation 14 months later to manage a special issue:
Dear Dr. Torny,
This is Mike Tang, Section Managing Editor of Publications.
We are planning to launch a new Special Issue, "Preprint and Open-Access Publishing", in the journal Publications, and we would like to invite you to act as the Guest Editor for this issue.
Wouah ! Preprint and OA publishing, exactly the topics I am interested in. I would easily find 10 colleagues in different countries who would provide very interesting and innovative contributions from diverse perspectives. Sure, I would also suggest expert reviewers, find 10 APCs in grants, manage the whole process and be proud of the results. All for free: I forgot to tell you, there is no financial incentive in getting the job done, no APC waiver,, except fulfilling your dreams as a knowledge creator and disseminator. And all the benefits of such a special issue, as well as your duties are being described in depth by the publisher. Despite being emailed with the exact same message3 more times, I did not answer.
How grey is that practice? If you do all this out of a genuine interest in science and by engaging your network, it would produce good science. But what would happen if you did it just to be listed as a guest editor, to let your friends’ papers through without peer review, or even to organise a traffic of fraudulent papers, especially in an organization which incentivizes acceptation over rejection? This is where the scale effect comes in: overseeing a special issue overseen by colleagues is not difficult for an editorial board, but how can you do it for dozens of simultaneous issues with hundreds of manuscripts to review? On such a scale, only complete delegation of evaluation is possible.
From predatory policing to mass resignations
After my narration I could state, with other colleagues that some elements of MDPI business models and practices are unpleasant, incentivize problematic publications or that its special issue model is deeply fraught at scale. That is a personal opinion based on empirical matter, it does not make enough to stand in an academic article. Especially as the “predatory” label has led to strong responses from publishers, as it has been seen again in the MDPI case. In July 2021, an article was published on the question of predatory publishing definition , taking the empirical example of MDPI journals. Its conclusion could be summed up like this::”The formal criteria together with the analysis of the citation patterns of the 53 journals under analysis all singled them out as predatory journals. “
Its fate illustrates the consequences of a black-and-white representation and the difficulties to qualify the ‘grey zone’ in academic discourse. In fact, less than a month later, MDPI responded point by point to this article on its website11. Above and beyond the refutation of some empirical data, MDPI would point out the problems to define the predatory category thus invalidating the overall conclusion of the author.. For example, they discussion the number of editorial board members:
” ‘It is interesting to note that the size of the Editorial Board was, in all cases, larger in the MDPI-journals than in the leading JCR-indexed journals belonging to the same categories’. The comparison is not like-for-like. MDPI journals are compared with leaders in the same JCR category, some of which are observed to have 0 Editorial Board members, and in some cases far lower numbers of published papers annually. The volume of rigorously reviewed papers that MDPI publishes requires many areas of expertise, to ensure that appropriate Editorial Board members are available regularly and not overburdened. The conclusion that having many Editorial Board members means that the journal is predatory does not follow.”
MDPI also insists in several occurrences that it is not unique among publishers, or at least among commercial publishers. It even acknowledges the possibility of predatory publishing… naturally into other publishing houses!
“MDPI is not alone in its ‘for profit’ status, and other publishers are publicly listed […],.. As we have previously stated […], we accept that some publishers engage in questionable activities and practices that may be characterised as predatory, but we are confident that authors, readers and academics are able to differentiate.”
So the author made a paper claiming a lot of MDPI journals were predatory, the publisher responded in a very civil academic way. What happens next ? One month later, Research Evaluation/OUP published an Expression of concern without detail, then retracted the article and published simultaneously a new version, redacted by them and the author. Beyond the fact that such a process is rare – you would expect a simple correction, has MDPI played a role in the process ? Was there pressure? How dit the author feel? As often, we have to turn to Retraction Watch to have all the details, with interviews of the author and MDPI12. We will focus here on MDPI position:
“We were expecting more transparency and communication, and to be informed at key stages of the progression of the investigation. As we have demonstrated, the original article contained serious flaws in its methodology, which have yet to be addressed or corrected. […] We would expect more details to be made publicly available for the readers so they can understand why this article was retracted and corrected. We found no track record of the original version retracted nor record about the corrections that have been made. In this case, we question OUP’s processing of this retraction/correction, as it would appear to be against COPE guidelines and standard practices.”
So not only MDPI claims to have been left in the dark, but ironically considers that the largest university press (and one of the oldest) does not follow best practices. Their call was heard as a PDF was published a month later as supplementary data, depicting all the changes between the original and the revised version. Let’s simply take the following two exemples:


In both cases, the author has kept her general argumentation, but she has abandoned her objective language in favor of verbal modalisations that leave room for subjectivity: we may think that these journals are predatory, but we no longer assert, without any possible discussion, that they are classified as such. In other words, we’re back in the grey zone where it’s up to everyone (authors, reviewers, publishers, institutions) to decide what they want to do.
And this is where we go back to our starting point. Why did I receive that invitation to join Publications editorial board in the first place? Because the vast majority of the editorial board of Publications had resigned a few months earlier, relatively discreetly. The most immediately visible trace came from its former editor in chief, Gemma E Derrick, which started the exit movement.

Her justification is typically framed as a ‘grey area’ one : it is not possible to articulate good editorial practices in her specific scientific collective with the multiplication of stories about the problematic practices of MDPI, the owner and publisher of the title. The subsequent resignations are reported by a Norwegian newspaper13. In addition to the reasons given above, it is also the case that this particular journal deals with publications that need to be brought even more into line with current publishing standards. I was already aware of the resignations when I received the first MDPI email, and that was an additional reason for me not to accept the invitatio, as it would belittle the move from colleagues whom I hold in high esteem, and not to show the solidarity they have thus expressed.
Unlike other cases of mass resignation from journals, Publications editorial board members didi not directly criticize MDPI, because they target the publisher’s general policies rather than their specific treatment. Their resignation reminds us that we can decide, in each of our micro-acts, in which scholarly communication world we want to live . Let’s take a final MDPI example: one journal had really become their flagship, International Journal of Environmental Research and Public Health (IJERPH). In fact, its growth seemed limitless, notably through the special issue format, to reach the incredible number of 16,889 articles published in 2022. And then, in April 2023, Clarivate announced the delisting of more than 50 journals, notably many Hindawi journals, but also MDPI IJERPH. What were the consequences? MDPI’s PR stated that still 90% of its content was listed by Web of Science. But authors fled in flocks as soon as the announcement was made, even before the journal was going to effectively lose its Journal Impact Factor.

Source: https://scholarlykitchen.sspnet.orgwp-content/uploads/2023/09/Figure-1-1024×530.png
This trend has been confirmed in 2024, with the total number of IJERPH articles making less than 10% of its peak in 2022, raising the question of authors’ responsibility. All it takes is Clarivate’s ‘quality signal’ to disappear for them to turn their backs on a journal in which they used to publish en masse. This is the magic of the grey zone, where one can venture without any real consequences. Playing with the rules, bending practices, encouraging mass production – these are not specific to MDPI, but to varying degrees are shared by all commercial publishers, with authors complying and most often editorial teams. And it is probable that their megajournals like Elsevier’s Heliyon and Springer’s Cureus will meet a similar fate.
Therefore, the ‘predatory’ label is easy to manage: run away, don’t participate, don’t submit unless you really want the publication to exist in the form of a line on your CV or quotes on your profile. On the contrary, the grey area is a zone of responsibility where anyone chooses whether to submit manuscripts, perform reviews or join an editorial board. Just like I would not go to an Elsevier-owned journal editorial board for obvious reasons, I won’t work for free at an MDPI journal. Still, we should do this “preprint and OA publishing” special issue somewhere else…
- On the geopolitical consequences of that position, see Taşkın, Zehra, Franciszek Krawczyk, and Emanuel Kulczycki. “Are papers published in predatory journals worthless? A geopolitical dimension revealed by content-based analysis of citations.” Quantitative Science Studies 4.1 (2023): 44-67, https://doi.org/10.1162/qss_a_00242 [↩]
- Boukacem-Zeghmouri, Chérifa, Lucas Pergola, and Hugo Castaneda. “Profiles, motives and experiences of authors publishing in predatory journals: OMICS as a case study.” (2023) [↩]
- For example, Tennant, Jonathan P., et al. “Ten hot topics around scholarly publishing.” Publications 7.2 (2019): 34.https://doi.org/10.3390/publications7020034 [↩]
- This is a theoretical division, actual tasks performed are another story see on the Diamond journals case, Dufour, Quentin, David Pontille, and Didier Torny. “Supporting Diamond Open Access journals.” Nordic Journal of Library and Information Studies 4.2 (2023): 35-55., 10.7146/njlis.v4i2.140344 [↩]
- To my knowledge there is no data on these policies towards editors, except on the question of paid editorial board members, especially in biomedicine [↩]
- Teixeira da Silva, Jaime A. “The Conceptual ‘APC Ring’: Is There a Risk of APC-Driven Guest Authorship, and Is a Change in the Culture of the APC Needed?.” Journal of Scholarly Publishing 55.3 (2024): 404-425.https://doi.org/10.3138/jsp-2023-0060 [↩]
- Lin, SK. Editorial: A Good Yield and a High Standard. Molecules 1, 1–2 (1996). https://doi.org/10.1007/s00783005000). [↩]
- Rene Aquarius, “My reviewer experience at MDPI”, August 2024, https://deevybee.blogspot.com/2024/08/guest-post-my-experience-as-reviewer.html [↩]
- Young employee’s death puts workplace culture in spotlight at publisher MDPI, Retractionwatch, 22nd October 2024 [↩]
- Paolo Crosetto, “Is MDPI a predatory publisher?”, 12 April 2021 [↩]
- MDPI: Comment on: ‘Journal citation reports and the definition of a predatory journal: The case of the Multidisciplinary Digital Publishing Institute (MDPI)’ from Oviedo-García, [↩]
- .Article that assessed MDPI journals as “predatory” retracted and replaced, Retraction Watch, 8 May 2023. Once again, it has become a very commented post [↩]
- https://www.khrono.no/truer-med-a-flykte-fra-tidsskrift-etter-at-redaktoren-ble-kastet/794389 [↩]