So I get what you're going at, but I did want to add that secure boot doesn't require Windows 11. And that the main issue with Battlefield 6 isn't the fact that it has secure boot enabled because you can use Battlefield 6 on Linux with secure boot. The issue is it won't pass the anti-cheat, which is Javolin if I remember correctly, breaks itself when in a Proton environment.

Being said, I don't think secure boot is the threat everyone thinks it is. Microsoft was originally not going to let alternative platforms be allowed on the secure boot environment. However, they started facing legal threats regarding it, including a potential ban in Australia and part of the EU stated they were looking into investigating it in regards to anti-trust, so they ended up caving to avoid having a judgment in court. I don't foresee Microsoft going back to making it so they're the only one allowed again,and if they do it's almost certain they'll be anti-trusted

I can see the concern on a Google attestion style system, but I don't ever foresee it getting that bad because people will just not use the system. The only reason it's working somewhat well for Google is because it's integrated into Android as a whole and practically forced upon developers if they want to use the existing integrity systems. Being said, I've only ever seen it in banking apps. I don't think I've ever seen it on a website to website basis.

Secure Boot and TPM are not Windows-only technologies. I'm secure booting openSUSE right now