Of course, and it's mostly DRM and/or anti-cheat. The studios want full control over the device running their IP, and they can't achieve that with desktop Linux, but they also don't want to leave the PC gaming market behind entirely to launch exclusively on consoles. Hence why the Windows versions of these games install rootkits on your PC, they aren't cooperating with the PC ecosystem, they are forcibly turning your computer into a locked-down console.

I hope they won't start providing their own tailored heavily locked encrypted operating system versions as a requirement to run their games.

and for a good reason, you want an infested cheater to be more a problem than currently bad problem that is happening????

giving a user freedom cause it to make multiplayer game to be more unbearable since its human nature to compete and come out of others ???? who would guess