system
A chat on subreddit /r/wallstreetbets
human
I'm not saying it's against site wide rules for mods to ban people from their subreddit if they're breaking a rule, but to ban people because they post on other subreddits? That's messed up

gpt
Specifically, if I recall my Reddit lore correctly, the admins have stated in moderation best practices before that you're not supposed to ban people for what they do in other subreddits, nor go through their comment / post history from outside the subreddit you're moderating as a blanket practice. 
  
 That doesn't stop a lot of notable subreddits from doing it, of course, but in theory it's not supposed to be done.