I know their games are hacked on Windows, I got the gist of what I posted from a couple of articles I read about 6 years ago where the big games developers were asked why not, that was their response. Apparently the old stigma attached to the word "opensource" (a stigma perpetrated by M$ I might add) and a fear they would lose or not make money (no sales and loss due to theft) that most simply hadn't considered it.
Also the Linux user demographics are changing, the purists are becoming a smaller and smaller cabal as more people like me have been discovering Linux, people who want a plug and play experience without the learning curve being too steep, Zorin, Mint and Ubuntu definitely meet that need. And we would be willing to pay for programs, games and even Mint or Ubuntu though not a lot for the OSs....... At least not what M$ charges for their products, maybe something more affordable for most people like a $20 or $25 outlay.
Heck, even though Linux makes up a small fraction that still equates to millions of users, sounds like a small but untapped market to me.
PC games were dying a decade ago. While Pirates claimed that had nothing to do with it, that people just liked consoles better, the advent of STEAM and the clones turned that around. Today PC games outsell all the consoles combined, it is the biggest game platform available, with Android nipping at it's heals.
The change was simple, using STEAM as DRM is fairly non-intrusive to the user. I find STEAM to be great, no CD or DVD's, no silly keys, no DRM shit to **** up my machine - yeah Ubi, I'm talking to you.
Linux will get games through STEAM and Origin, but no one is going to release them in general, they would sell one copy which would find it's way to 500 million machines. But remember that games need horsepower. I spend in the realm of $5-600 for a graphics card every couple of years. The guy running Mint on 200mHz Celeron isn't going to find a pleasurable experience running AC Blackflag.