This happened last year, where basically most of the daily uploads in the fansite category were deleted within like 12 hours of being posted from like October until like January. If you wanted anything in those categories you pretty much needed to be there to see it uploaded.
It doesn't help that more people are discovering the site and sharing links with no masking AND the site is for some reason indexed by Google. As google search becomes weirder this site pops up first page pretty easily when searching for some creators and they are able to DMCA incredibly effectively.
Its the downside of popularity. So there are less studio videos, more OF videos, people google them more, find this site, including the creators, it gets DMCA'ed. There also seems to be someone like almost hired to just report whatever pops up on the site en masse.
Other private torrent sites don't deal with this because the site owners don't let them get annexed by Google Searches. At this point I imagine its almost too late, I have no doubts some creators literally just join the site to report things.