>Valve should. Valve is the one making these games available for purchase on non-Windows platforms.

it sounds like you're suggesting valve should be restricting which games they sell depending on the platform you are viewing from?

that would be annoying, and ultimately futile. i purchase games from my phone to play on my pc, or from one pc to play on another. i purchase windows-only games and mess around to see if they can work with proton. etc. i do not need valve to coddle me like that.

"system requirements" is at the bottom of every listing.