Yeah, but cheaters can be banned manually or via automated system (checks for flying, high speed, etc.) and in a lot of multiplayer games movement is not validated to enhance game experience for client side.
In this case it’s certainly easier to toggle 2 boxes than modifying engine code to prevent server side issues with streaming assets.
That’s a lot harder than you think. You have to be hella sure you know what they did, how they did it, and can prove it.
PlayerUnknowns Battlegrounds uses client auth movement and it’s lit with movement cheats. 200,000 bans a week globally. Yet, you can just get another free account and play an hour later.