I am not sure they are the best. I got permabanned once for posting a link to removvedit (a website to show removed posts). They did not just delete the post they really permabanned. I double checked the rules and saw no mention of this being forbidden before posting.

I tried appealing but they did not want to cancel the ban because I dared criticise their moderation (I found permaban to be very extreme and I disagreed with their decision).

Since that day I can’t help but wonder how many users have been permabanned for small reasons