Doesn't Counter-Strike still have this? It serves a different use case than a proper ranked mode, usually, though I'll admit I'm long out of the loop on Counter-Strike.

While I agree that this is usually enough, you end up with the issue that with volume the process becomes bogged down to the point of inefficiency. The best bet is to implement this system with a much more robust server side cheat detection, and ideally not send occult information or recieve bad information from the clients to minimize the damage that can be done with a cheat.

I didn't know CS did this, but yeah, at a high level, that's how I'd address it, too. It's probably not a solution that scales super well due to the manual review required, and I know that game has a reputation of people still being annoyed by cheaters, but it might be the best we can do without being very invasive, like the ring 0 stuff.