[wlesieutre]

Subreddits are pretty heavily moderated via the "report" buttons. Moderators are basically whatever community member created the community plus the other volunteer users that they picked, and if you have a problem with a subreddit's moderation the usual response is "It's my sub, you can leave."

I'm not sure how that would work for facebook.

[ben_w]

Reddit recently deleted a whole bunch of subreddits because they decided that wasn’t good enough.

Anecdotally, I know someone who was interested in one of those topics (zoophilia), who thought the subreddit in question was “a dumpster fire” yet was still upset about it being banned.