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Steam data reveals PC gamers shifting from Windows to Linux
(www.tweaktown.com)
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Developers already care about it. Not all of them, not all the way, but many are aiming for steam deck compatibility via proton. It's not perfect, and some devs are vehemently holding out, but it's progress!
That doesn't seem to take a lot of effort. It's still a windows binary. And it's unfortunately simpler than figuring out if the user runs X or not.