>>30708269When they collabed with DLSite they asked them to take down niji doujins which basically broke the unspoken rule about not interfering with the doujin community that exists in Otaku circles.
Doujins have always existed in a legal grey area - the company who owns the IP always has the legal might to enforce their copyright and shut down fanworks. But most bigger IPs tend not to do that because doujin circles and Comiket in general serve as a HUGE advertisement for your IP. So the entire doujiin scene exists on a trust based system.
Anycolor were fully within their legal rights in taking down DLSite doujins, but by doing so (moreover, without any prior warning) set a precedent and broke the trust that usually exists between the IP holder and the doujin scene.
Now these artists are afraid that all the effort that they spend on a nijisanji drawing or hentai will simply get pulled by the platforms they sell on.
That precedent means that people doing Nijisanji fanworks are no longer sure whether they can make money off them, and some artists were also angry that their trust was betrayed. As such the number of Nijisanji fanworks have naturally reclined this year.