I got banned from around 15 popular subreddits (which I didn't read or participate anyway) for posting a comment in r/conspiracy which wasn't even related to the vax. There are thousands of cases like yours and mine and worst of all: it was fully automated. You literally posted anything into certain subreddits and you get autobanned in communities that aren't even related by any metric.

I didn't bother appealing since I don't care about those but it felt really dumb and perhaps a clear sign of Reddit's end times.