Most claimed "auto-bans" or "ban on sights" are processed bullstuff from the rumor mill.
Okiver is probably the only person who is truly ban on sight. Computermix isn't even really ban on sight, he's just on a short leash and that dude literally hand makes game breaking hacks. Iban is a real nig nog but I have a feeling Badspot wouldn't just ban him on sight rather than wait for him to do something.
Badspot will claim every once in a while that someone is "done" or "out" or what have you, but it's far too much energy to actually monitor who's who and ban 50 different people on sight. At the end of the day most people can come back after a few months after being told to leave forever and Badspot will just let it go until you become a problem.