Obvious, cheap solution (to this controversy): make it optional. If people don't want to install a rootkit, let them play with other people who are willing to play in a rootkit-disabled session. I seem to recall this was how e.g. punk buster worked 20 years ago.
This is technically already the case for many games already. For example for EasyAntiCheat, the EAC kernel module won't be loaded unless you join a server with EAC enabled.
