Lots of people here keep mentioning that most shadowbans were caused by things they said, usually related to politics, but I've been instantly shadowbanned (and then suspended) after posting a comment about gnats fungus in the houseplants subreddit that, as far as I know, had nothing to do with politics.
Before this, it happened after posting a comment about digital art (which again had nothing to do with politics); so the question still remains: What is the point of all this besides making people frustrated and disappointed?