I recall reading a while ago about some OF content creators being upset that their stuff was being leaked to some scraper sites. Coomer.su was one of the ones mentioned in the story I was reading.

As to how much content is there and whether or not it's real, I couldn't say, but you've triggered one of those "I'm sure I read about this site a while ago" moments.

After a quick check of their site I see there's even what looks like a very well documented API, so you could even write a script that would let you scrape a creator's content from there if you were so inclined/had access to an AI tool for writing code.