Does that ultimately matter? Proton/WINE etc. create a compatibility layer for Windows on Linux, and WSL/Cygwin etc. creates a compatibility layer for Linux on Windows. If one is cheaper and offers less bullshit, the other one is threatened. It's a moat coming down.
A lot of games run on Linux natively and newer games are using Vulkan. We can't help that the feds didn't go after Microsoft for paying game devs to try to lock non-console games to Windows.
If you search for Windows XP, Vista, Windows 7, Windows 8,...., versus Linux, you will find similar arguments being made as prophecy of the great migration.
previously there wasn't an extremely profitable, market leading, privately owned gaming company with a founder that is completely and utterly determined to ditch Microsoft
and share the result of that freely with the world
I am an employee of a well known Fortune 500 consulting company, but definitly not Microsoft, better luck with your search next time.
Microsoft is a company, there is no such thing as honour for business, only money and profits.
Same applies to dumb quotes like "do no evil" and similar.
You're right, Windows isn't the main target platform for AAA game studios, Playstation, XBox, Switch, iOS and Android are the ones briging big bags of money home.