You could probably detect those kinds of cheats heuristically on the server. There are limits to human ability. It’ll take more time to catch the cheaters, but I’m sure it’s possible.
This player is posting 30 auctions per second. Bot.
This player is turning at a rate of 500 radians per second to make perfect headshots. Bot.
Aimbots will just add delay and variance then. Guess its a bit fairer but if they're better than shroud level then it's still not great.
Which they do already, because slamming all of the aimbot settings to max is a fast track to getting mass reported and escalated to human review, which will immediately see what's going on. Any cheater with an ounce of desire to preserve their account is going to try and maintain the pretense that they're just very skilled, not impossibly skilled.
this is already running in production for Counter-Strike since 2018 [0][1].
to be honest, it isn’t particularly good - all serious CS2 games operate on a third party provider with a kernel-level anti-cheat. also, the cs2 update banned people for spinning their mouse too fast [2].
[0]: https://www.reddit.com/r/GlobalOffensive/comments/5u2xly/eli...
[1]: https://www.youtube.com/watch?v=kTiP0zKF9bc
[2]: https://www.youtube.com/watch?v=JwU_ejDNC0s