You're also free not playing their games. I grew up hosting my own game servers so I'm no stranger to that, but I also enjoy games that are not compatible with that.
It also doesn't really matter if they have kernel stuff or not, unless you game on a different user a user space process can already read all your files and even memory of your processes.
> even memory of your processes
That's not a thing on the default config of any mainstream distro I'm aware of; everyone restricts attaching a debugger and similar to root by default these days.
We're also free to hack the games and make them work the way we want. Just like we can install uBlock Origin and kill advertising.
The computers are ours. We are the gods of our digital realms. Their software is running under our control. This "take it or leave it" nonsense doesn't really fly. Adversarial interoperability means there's any number of options available to us.
https://www.eff.org/deeplinks/2019/10/adversarial-interopera...
The notion that people would willingly give up this godlike power just to play online video games without cheaters is one of the saddest ideas I've ever come across. Gamers would reduce our personal computers to consoles without a shred of guilt. I barely have words to express how I feel about that.