Not sure if this is what you're referring to, but this was done last year in secret by ESEA, a US gaming league (primarily Counter-Strike) [1]. They claim the

Not sure if this is what you're referring to, but this was done last year in secret by ESEA, a US gaming league (primarily Counter-Strike) [1]. They claim the value was almost USD$4,000 over about two weeks, although we don't really know how many users were affected and for how long. This doesn't seem like an extraordinary amount, though, especially if we're talking about using mobile phones instead of high-end gaming PCs. [1] http://www.pcgamer.com/2013/05/01/esea-accidentally-release-malware-into-public-client-causing-users-to-farm-bitcoins/ http://www.pcgamer.com/2013/05/01/esea-accidentally-release-...