There were a lot of arbitrary rules that would be easy to break like on AskReddit where if you included anything in the body, your post got removed. Or subs like AITA, TIL, etc. that required you to include AITA and TIL in the subject or your post got removed.

And then some of the rules were temporary, and you’d never know. Some subs outright banned any posts/comments that mentioned COVID at all, in any way.