I had an account once that was banned, but only because I disliked that account's name and asked the DeviantART staff to ban that one so I could switch over to this one. Other then that... nope. No bans. No warning. I've got a clean record (as of yet).
I've never been touched, really. Since I'm online rarely enough as it is. Eh, I just get on and check my messages and watches. And...wow..after a month I have like over 200-something...anyway, I've never really been banned, threatened or had any of my artwork deleted, honestly. Then again, I don't even remember what I put up anymore.