Blizzard posted an official annoucement on their forums that they have kicked
over 320,000 accounts from Battle.net they found were violating the terms of
service.
We’ve recently banned over 320,000 Warcraft III and Diablo II accounts
that were found to be violating the Battle.net Terms of Use. If this is a first
offense, the CD key associated with the banned account will be suspended for 30
days, while repeat offenders will see their keys banned permanently. All account
ban decisions are final.