While Diablo III supports both Windows and Mac platforms, Blizzard has yet to issue a Linux port for its hit action-RPG sequel. However, that hasn't stopped other Linux users from trying to play the game on their rig, using a third party program such as WINE.
Now, some of those players have accused Blizzard of banning them from playing Diablo III with their Linux setup. In a post on the game's message boards, there are a list of recent complaints from players who said they were able to play the game until late June. One player sad that he had been playing Diablo III " ... on my FreeBSD machine now for a couple of weeks and have a level 53 Wizard" before receiving his ban notice.
Blizzard has since responded to these protests, basically saying that while Linux isn't officially supported in Diablo III, that was not the reason why some people who happened to be playing on Linux got banned. Blizzard states:
We’ve extensively tested for false positive situations, including replicating system setups for those who have posted claiming they were banned unfairly. We’ve not found any situations that could produce a false positive, have found that the circumstances for which they were banned were clear and accurate, and we are extremely confident in our findings.
Playing the game on Linux, although not officially supported, will not get you banned – cheating will.
Source: Diablo III message boards