How does a player get banned?

Just noticed a player from one of my tournaments has been banned. His name is DanVM. His rating was over 2000 and he played over 1000 games. Just wondered what he did to get banned? Does anybody know?

that particular user was removed for engine use.

"How does a player get banned?"
By violating the TOS (Terms of Service), link is at the bottom of every page.
(http://www.redhotpawn.com/myhome/termsofservice.php)

At point 3. you can see why you can get banned.