I for example, got permabanned from one of the major politics subreddits.
Basically what happened was I wrote a post, and some guy responded to me with a firehose of personal insults. I called him a troll in reply, and within 30 seconds of posting said reply, I was permabanned as a first offense, without any possibility of appeal.
I'm guessing that person signed up with a Google account that was connected to other Google accounts, and when they tried to make a new account it was flagged as "ban evasion".
Basically what happened was I wrote a post, and some guy responded to me with a firehose of personal insults. I called him a troll in reply, and within 30 seconds of posting said reply, I was permabanned as a first offense, without any possibility of appeal.
Mods be powertrippin over there.