That was my thought as well, since they count installs and not use count of bought copies directly from a platform.
What if people create cracks for legit purchased games, e.g. on Steam, which only removes the Unity tracking part?
A simple Firewall rule which "fixes it" for all games installed on a machine might work as well?
I believe it might be similar or the same procedure for every game using Unity. We might see this popping up at some point.
That's already available for insiders and can be enabled, meaning it will soon-ish come to the stable versions of Windows 11.