So long story short, the anti-cheat software can detect if you’re using a different signing key?

Hi, I’m cadekat, and I have a bios password and custom keys in my secure boot. Pleasure to meet you :3

Can’t you load your own keys into your BIOS, letting you sign whatever you want anyway?

Secure boot can be used as part of a chain that eventually ends with unlocking your cryptographic keys only if the software stack has not been modified.

Sure, for most people that’ll make little difference, but it is an actual benefit.