Pasting my comment from another thread.

From what I understand a user(Lmao/Angled) was "sub-lemmy camping" (took up thousands of popular sub names and wasn't doing anything with them) so lemmy world banned him from that instance. He had a hissy fit and "vowed revenge" and has been attempting to do as much damage to .world as he/they could since. I can't find the original post but https://old.lemmy.world/post/943832 and https://old.lemmy.world/post/1720870 has a bit of detail.