The more common and realistic attack is anti cheat software and DRM. They are functionally identical to rootkits/spyware in that they install themselves as kernel drivers and monitor literally everything you do (sometimes when the game is not even running) to work out if you are cheating/attempting to crack the game. And we have no idea if they are limiting themselves to just that, they could be selling your browsing history on the side as well.

The DRM is super invasive as well, A lot of wine developers have to deal with denuvo repeatedly banning them as well as one user reporting that they were banned from valorant after plugging in their phone to charge it.