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throwaway48476 | on: Steam games will need to disclose kernel-level anti-cheat on store pages
Critical as in "my gpu is a paperweight without a driver".
sgjohnson | parent
GPU driver can technically be userland too.

Look at what Apple has done in recent years. kexts (kernel-level drivers) are basically all but unsupported today, and both DriverKit and IOKit are fully userland.

throwaway48476 | root | parent
Performance critical drivers are always going to be kernel mode.