Because large amount of cheating and hacks usage in Warcraft 3 and Diablo 2, Blizzard have banned 320,00 accounts.
Users that have used hacks first time get 30days banns on they cd-keys.
Other users that have cheated non-stop they got perma-banns.
We would like all players to remember that abuse of unintended mechanics and/or use of third party programs is a violation of the agreement made when signing on to Battle.net, and can subject your account to disciplinary action up to and including a permanent ban of its access to the service. These types of activities can severely impact the stability of our servers, and we’ll continue to aggressively monitor Battle.net in order to protect the service and its players from the harmful effects of cheating.
Blizzard had good help from players in banning hackers, other players can report hackers on Hack Report Form.
This is good warning for other players to not use hack on Battle.Net.