Media files are proprietary and it’s under the zlib license if that disqualifies anything, but for a somewhat decent experience, there is H-Craft Championship. Not the greatest of games considering it’s a game that originally released in 2007 as a commercial game available for Linux (don’t know about other platforms outside of the 2015 open source(?) release) by some seemingly random independent studio (Irrgheist), but fun enough I guess.
Have they tried forcing people to upgrade to AI PCs in order to receive security updates by checking to see if your PC is an AI PC? You know just to prove people really want AI PCs?
/s