Steam doesn't even have a native x86_64-only Linux version, you still need x86 runtimes.

Though it is possible to use FEX-EMU to run it on Linux on a Mac: https://youtu.be/_tG3kfgqPhc

That's a 7 and a half hour video. Is there any particular piece of it that's relevant, or "just watch the whole thing"? ;)

That's one of the Asahi Linux (the ARM Mac Linux) GPU driver developers trying random games on Steam on Linux on an ARM Mac. Showing it is possible to run games. Nothing too specific, you can just skim it to see what games are booting. I recognize Portal 2 and Battleblock Theater.

Cool, that sounds kinda promising then. :)

Steam doesn't even have ARM64 support on Windows or macOS. And neither do most games.

Damn. Oh well. :/