Linux gaming support is really at the mercy of the engine Devs wanting to do it. There isn't enough of a market share for it to be "obviously viable" (i.e. stupid not to do it) last time I looked into the numbers.

Both Unity and Unreal Engine are multiplatform enough to support compiling a Linux version of your game just by clicking your mouse -- everything just works out-of-the-box with no extra work needed. That's why there have been so many more Linux games on Steam in the last few years than there ever have before (I remember 10 years ago when the iD Software games were pretty much all we Linux gamers had).

It's AAA games that use their own engines and developers that are too lazy to click the Compile for Linux button in Unity that are holding us back.

It is likely to lead to more developers using Unreal Engine and selling through Epic Games Store, which doesn't support Linux.