Never been banned (to my own surprise) but I’ve gotten quite a few infractions; nearly always for talking about politics/religion. It’s rather noticeable, leading me to consider it not a matter of rulebreaking but of political disagreement with the mods in question.
The fact that that on another board one of the mods in question was discovered to be part of a group of alt righters explicitly trying to subvert the board to their way of thinking by manipulating board moderation didn’t exactly cast doubt on that opinion. Big scandal on the board, there; they ended up mostly leaving to create their own basically-Nazi board.
Never been banned (yet), but I’ve been denied entry. Some anime forum insisted on a detailed profile, which I filled out with bogus personal information (way too may personal questions like “favorite …”) and a legitimate disposable confirmation email address. Got an email telling me my account request was denied.
I’ve never been banned. I did get a nastygram from a moderator at one forum telling me that they considered the word “incel” to be hate speech. I don’t post to that forum anymore.
A few and more if we go back to the BBS days. Mostly small specialized forums that are long gone and basically a way for the admin to stroke her/his ego. I did something to get my original screen name banned from AOL, I can’t even remember what.
I’m not really sure why, but I’m suspended from putting edits on Wikipedia until April 2021. I can’t even remember when was the last time I submitted an edit, but the reason given was that I had abused the privilege.
Mostly my edits have been about correcting spelling (and egregious grammar) errors.
An amusing temp ban that I got was on the old World of Warcraft forums. I used to get in a lot of heated arguments with people that would boil down to ‘you can’t expect people to show more loyalty to a video game guild than a real life job or romantic relationship’ and ‘if your guild doesn’t actually offer any benefit to players, people won’t join it’. But the only time I got moderator attention was when I cracked a joke about ‘you can only marry one person… well, unless you’re in Utah’ and got a three-day ban for “hate speech”! I found that hilariously over-the-top, but refrained from cracking jokes about Utah’s history of polygamy from there on out.
I’ve been banned from one subreddit without posting in it. Apparently they police subreddit they consider bad, and ban you for the crime of making an innocuous response to an innocuous post you found in general postings, because it’s “bad.”
during the SDMB vs Left Behind board war, I was banned at Left Behind for stating that the Roman Catholics do not pray to the statues and were not worshopping graven images, followed up by disagreeing with a Mod who stated that the Pope was the Anti-Christ
Banned from Pinterest twice for having inappropriate content in private sections of my feed. All content linked from other feeds on Pinterest. No idea what the inappropriate content ever was.
I once got banned from the Blazin’ Squad messageboard, but I totally deserved it. Apparently they didn’t like the suggestion that maybe every single post shouldn’t consist of a few badly-spelled words followed by six inches of flashing gifs in the signature block to scroll past.