not sure if you're trolling or not but last i heard people simply strapping an exercise/weighted wrist band to the steering wheel which simulated torque being applied to the steering wheel which leads a Tesla to believe someone is paying attention. A quick search on Youtube reveals more than a few videos confirming this.
It may have been true at the time, but now Tesla uses the interior camera to make sure you are paying attention to the road.
If you don’t want to use the FSD beta, you don’t have to activate the camera, or you can put tape over it. With either of these actions the user can opt out but will not have the ability to use the beta.
No I was being serious. Searching turns up defeating the system with someone in the seat but not without. The other commenter provided a video showing it is possible from two month ago.