A new preprint introduces SI-hacking (Special Issue hacking): when guest editors turn a special issue into a publication venue for themselves. :oa: https://arxiv.org/abs/2601.07563 Yet over 1,000 "hacked" special issues are still published every year. Strikingly, #MDPI accounts for 85% of all SI-hacked special issues in the dataset, while #Frontiers contributes another 13%. #AcademicPublishing #ResearchIntegrity #PeerReview