I guess radar cheats where the ethernet cable to split to a second computer could also be considered a hardware cheat, since it's running between an airgap.
Incredibly difficult to detect, you basically need to model the way users behave differently from bots... but at the high end of competitive play people tend to approach more bot-like behaviors.
Even if you made a specialized item it would still cost a lot mostly due to the ML requirements. Maybe smartphone + a specialized input device would reduce the 'cost', but you still need to buy a several hundred dollar cell phone.
Besides, I know like 90% of cheaters are 14 year old kids who used the first google result because it's so easy to. Any resistance and that'll stop a majority