Nah I can't agree with this. I don't think there are many games with anti-cheats solely on the server. Even Valve has its VAC.

I agree that Kernel anti-cheats are bullshit, I don't want a rootkit on my system. But if you are already running a closed-source game, it's not a stretch to run its local anti-cheat.

And local anti-cheats make sense in and of themselves since you can't easily detect things like visual hacks from the server-side.