That certainly isn't thanks to Apple
Applying the security settings per partition instead of per device is much more flexible, and you don't have to worry about Microsoft controlling which OS signing keys are valid.
Oh thank you master for allowing me to boot a different OS!
Being allowed to run whatever OS you want on your device is a right, not something you should need permission for.
[0] https://support.apple.com/guide/security/rosetta-2-on-a-mac-...
[1] https://discussions.apple.com/thread/256079635?sortBy=rank
It can also depend on how much effort the developer has put into a particular platform. Macs have not historically had a reputation as being a big market for games, not even in a relative sense, so some developers may not much effort into a Mac port.
Valve is even borrowing some of the work done for the Mac version of Linux to add support for Proton on ARM hardware.
> Gaming on Linux on M1 is here! We’re thrilled to release our Asahi game playing toolkit, which integrates our Vulkan 1.3 drivers with x86 emulation and Windows compatibility.
https://rosenzweig.io/blog/aaa-gaming-on-m1.html