Also, not subreddit-subreddit, but multiplex times, posts of mine got reported to admins for hate speech because I said "retarder" in a mechanical focused subreddit, and I suppose they don't care to take the time to realize it's a perfectly fine piece of technology and not an ableist slur before sending out threats of banning you forever from the site.
That rarely happened with phpBB but I don't know about Discord. That fact makes me feel a little old.
Bulletin boards with any kind of roadbump to registration could make it a bit harder for a bunch of atrocity tourists to start showing up and mocking someone directly but you sure couldn't stop them from screenshotting you and kicking you around on their board.
(okay alt.fan.warlord is maybe a bit of a stretch given that it was generally confined to only making fun of people's signature blocks, but...)