Many of the cheater ridden games don't even do a simple CPU based PVS check on the server side. You don't need a GPU for this because it's super fast.
An example of strictness in protection using PVS: https://www.youtube.com/watch?v=8w1ICIBO3D4
Tarkov for example doesn't even do a super simple check.
Oh and there's many more performant methods such as https://github.com/87andrewh/CornerCulling