> present the players with a bot who's purpose is to be un-hitt-able unless the player is cheating

Escape from Tarkov had/has something vaguely similar to this. They'll put a very valuable piece of loot in an inaccessible room under the map or inside a locked car and monitor which accounts pick it up. I think Call of Duty warzone did it as well with the fake enemies that only accounts suspected of cheating will see