Indeed, I've seen several subs put in new rules where certain topics aren't allowed to be discussed at all, because the administrators told them that the sub would get banned if the users went against the beliefs held by the admins (even if the admins had a minority opinion when it came to the country as a whole).

Then there is just arbitrary or malicious enforcement of the rules. /r/Star_Trek was told by admins they would be banned if they talked about /r/StarTrek at all, so now that's a topic that's no longer allowed in that sub. But there are tons of subs set up specifically to talk about other subs, where just about all posts are about other subs (such as /r/subredditdrama), and the admins never bother them.

I don't think we can have a conversation about moderation when people are pretending that the current situation doesn't exist, and that moderation is only ever done for altruistic reasons. It's like talking about police reform but pretending that no police officer has ever done anything wrong and not one of them could ever be part of a problem.