How would hardware attest to the game server that the player cannot see through walls, and that their aim is not nudged (subtly or overtly) in the direction of enemy faces? Keeping in mind that the cheater has full control over the software running on their computer, so they can decide what to send to the server. Also the cheater doesn't need to alter the game itself, they could access the game memory and implement their aimbot by having a clever mouse-driver.