I see people when trading accounts are worried about any bans before, and i understand now why, because i didn't now. So in total are 3 bans.
There is permanent ban on your first time and it depends on how bad you did in the forum AFAIK
all users should comply but some users can't stop making shitty post because being not good in English so still it can lead to permanent banned if they buy or bought accounts that got banned in the past. i think they are only avoiding it so they can still have more chance on their account in case it got banned on their possesion