Now look at what percentage of time users spend playing windows game is spent in a game that works on Linux. This raw game count metric is sqeued because everything someone releases a Unity game it will most likely work out of the box. Due to there not being that many game engines actively being used in modern times the scope is not huge. Bigger issues like Linux not having good enough security means that anticheats do not allow it.
See how with mac os, games like LoL and Valorant do not need a kernel anticheat because the operating system provides enough security.
LoL didn't have kernel-level anticheat for the majority of it's lifetime; when it was added to the game, Apple had removed kexts from the OS entirely. And Valorant doesn't support macOS in the first place, presumably because it didn't run Riot's Ring 0 anticheat at-launch.
See how with mac os, games like LoL and Valorant do not need a kernel anticheat because the operating system provides enough security.