Only if you’re talking about forum bans. That’s what the Refugee Camp is for (and it’s the only forum you can see and post in while banned on the forum). The mods are actually pretty reasonable about people breaking rules without understanding they’ve broken them, and an apology and a promise that you’ve learned and won’t repeat X-bad-behaviour will usually get you a reduction or an unban. If you’ve been around for years or it’s your third ban for the same thing, you’re maybe not going to get as sweet a deal since you should’ve known better. *I’m not a mod, I can’t promise you anything as far as ban mercy goes, it’s just the general way the mods go about things here and have for years.
It’s never reversed a VAC/EAC ban (Steam Support is the only ones you can talk to about VAC, and so far nobody’s come back with proof of an unban, and the EAC guys browse this forum but run their own as well), and the devs have begun to issue bans on the official servers for disruptive chat and hacking. As of yet, I have not seen any official dev response in the forums on their policy about server bans for spamming the chat, but so far nobody who’s been hit by one has reported an unban.