Unfortunately but understandable; the vast majority of the gaming market is on MS/Windows, and as shown by Linus' recent videos on the state of Linux/Linux Gaming, its not ready yet and suffers from massive fragmentation; and as reported by other devs, tends to cause a lot of development/support requirements, for a minimal return.
In the future if MAC/Linux continue to grow, they may begin to support again, but right now, it, unfortunately, makes sense.
linux is for conspiracy theorists and hackers, I doubt they even game.
mac owners probably have a playstation