https://www.techradar.com/news/steam-game-is-removed-after-allegations-of-sneaky-cryptocurrency-mining

An indie game on Steam was allegedly using the host PC to run a cryptocurrency mining script for the developer’s benefit – not to mention attempting to scam punters with fake items copied from Team Fortress 2 – leading to some controversy concerning Valve’s policing of its online games store.

The game in question is Abstractism, and it was a simple platform-type affair where you guide a black square around a series of sparse looking levels, but it has since been removed from Steam.