The burden should be on the developers and a server side solution.

There are some fundamental limitations on what you can do with purely server-side solutions. If you're playing online card games, sure, you can do viable pure server-side stuff to resist most cheating. That'll get everything short of using, say, a calculator to compute probabilities or count cards or something.

But with, say, FPSes, that's not really practical. You need to have some information on the client that the player shouldn't be privy to to mitigate things like latency. For example, if another player runs around the edge of a wall and becomes visible, your client needs to know that it's behind the wall and rounding the corner to rapidly show the opposing character becoming visible. And that means trusting client side code to not be running a wallhack. And that entails trusted hardware to do reliably, and that can't be done by the game developer

it's gotta have support from Valve if you want that.