Maybe it’s this topic and how it intermeshes with technology. Some people seem to think that there’s a technical solution for this already (one that works as well if not better than human moderators).
So 4chan has this problem a lot but they are also based in the US where its most definitely illegal and they IP ban people and I think for the most part it works. It did suck though - I don’t go on there anymore but in the last few years I did, if I was on mobile, I would often get hit with a region ban because so many people in that area were banned that they just decided to block an entire IP region to prevent anyone else posting illegal content.
maybe look into IP and region banning to prevent someone from just making new accounts.