In my understanding, Secure Boot has absolutely nothing to do with games or kernel-level anticheats some games use. Those latter are completely different beasts, more similar to drivers. There are many concerns about Secure Boot, like how it can harm Linux adoption or eventually give MS hardware control overreach.
Idk, this is the first time I hear about it. Do you know which particular games do this? I played few with kernel-level anticheats (Genshin Impact, League of Legends) without having Secure Boot on, even though my hardware fully supports it and I have it enabled now on Linux.