I'm at the moment quite sick of competetive multiplayergames in general. If you have to resort to malware to thwart cheating in a cost effective way maybe the very Concept of anonymous(as in playing with randoms instead in small communitys on moderated servers) multiplayer itself is flawed
Malware implies malicious. It's not malicious - it's extremely intrusive.
Ultimately I don't give a shit if they have every bit of data on the computer I play games on: there's nothing there worth looking at. I do my private stuff on my phone. Gaming PC is for discord, games, and making shit for the games.
So I trust their root kit. They can't do anything to me there.
"I'm OK with companies using incredibly shitty, intrusive software practices because I don't think they'll affect me personally" is such a shit take for so many reasons, to name a few:
giving software kernel access, especially when it does not or should not need kernel access, is a security risk, and does open the door for malicious actors to take advantage of vulnerabilities even if the software is not malicious in and of itself
occasionally, intensively intrusive programs like this do break things unintentionally, which can lead to all sorts of fun issues. StarForce DRM is a good example from years past.
just because you do not have anything on your PC that you consider sensitive, does not mean that applies to everyone.
Kernel level anticheat can be bypassed. It's usually not cheap/easy, but it can and has been done. Meaning, for all of the above concessions you make, there is no real benefit.
these are just the few I can think of immediately.