I think the true cutoff for me with Reddit was when they perma banned me for commenting that I should in fact be allowed to punch nazis (pretty sure it was a mass report thing going on)
I was temp banned from all Reddit when I messaged the mods in a subreddit to complain about a post.
I think thousands of people did the same thing that day, it was a really obnoxious comment section that ticked off many ; but someone had connections and they issued everyone who complained a three day ban site wide.
Reddit mods can be such shitstains about... Well, pick a topic! They don't like what you did, banned, asking about your ban? Banned from communicating with them for a month.