Why is it not more common to implement anti-cheat on the server instead of the client? Is that not more secure? Couldn’t the server just check what vision a player should have and not provide any other information to prevent wallhacks or maphacks? Or check how fast it is possible to move to prevent speedhacks? Aimbot is a bit harder to detect I guess but what about the other ones?
Sure, but client side is also owned and run by the cheater. Do you really trust them to always run the anti-cheat honestly?
Anti-cheats are typically designed so that the user can’t actually modify them at all. They install themselves deep into your system, sometimes literally in the form of a rootkit which basically runs parts of it completely invisibly from your OS, entirely.
The problem is that these measures can be bypassed
https://guidedhacking.com/threads/how-to-bypass-anticheat-start-here-beginners-guide.9882/
But it is complicated enough that most people don’t bother with it.
So is cheating, yet we still have cheaters.
Of course, which is why all cheating has been eradicated forever. Certainly no game with a rootkit anti-cheat has ever had a problem with cheating.