https://www.statista.com/statistics/218089/global-market-sha...
(reminds me of the IE market share graph actually)
For convenience:
Windows 96.37%
OSX 2.37%
Linux 1.27%
Gaming wise, that's pretty dire. Proton is pretty nice on Linux, but still doesn't and probably never will support all of the titles that people might want to play. In addition, I doubt many companies out there want to test their game releases on multiple OSes and try to fix all of the bugs if they can even port the games, all for less than 4% increased profits.And from the looks of things, Windows is on the decline. Linux and Mac are actually beginning to rise. Unknown are generally unknown Linux distros, and then there is ChromeOS and the recognized Linux distros. Together, that makes Linux about 13%
According to that, Windows' world wide market share is now under 70%. It lost 6% in the past few months starting in December.
A lot of this I find have to do with Valve pushing for Linux gaming. And there is also ChromeOS too (which is Linux). Then there is the unknown portion (which are mostly unrecognized Linux distros). That altogether makes Linux about 13%.
Really, it's the end of an era were Windows is actually relevant for the majority of PC gaming. And with people hating Windows more these days, they are weighing their options from the looks of it.