It’s not nothing. One of the mods in /c/Risa was being overzealous about removing content. I think the post that started it was about Sarah Silverman making out with Tim Russ during the filming of Future’s End. The post was removed for “not a meme or shitpost” which some of the community felt was against the purpose of the community since Risa has no rules. People made a few posts asking why that post wasn’t allowed and those posts were removed. Stamets et al created this community a few days ago in response. That’s as much as I know about the situation.

Edit:

some different people are here bc risa removed a no-effort ai post and a celeb tablod post and they want that content i guess

In response to your edit:

This is the entirety of the sidebar on /c/Risa “Come on’n get your jamaharon on! There are no real rules—just don’t break the weather control network.”

Where does that ban ai posts or celebrity tabloids? The correct thing for the mod to do would be to make rules if they don’t want those posts not remove them and all discussions regarding said posts.