The Tesla system nags the driver periodically to touch the steering wheel to let the car know that the driver is paying attention. If not, it will eventually shut off the autopilot for the remainder of the trip.
But the system is defective in that it can be fooled by simple DIY hacks that inhibit the warnings and the eventual shutdown, as demonstrated in this video:
“How to trick autopilot in Tesla model 3”
https://www.youtube.com/watch?v=gFUwOwyvTlw
Tesla must be aware of this, but they don’t seem willing to fix the problem.
“But the system is defective in that it can be fooled by simple DIY hacks”
Sounds like the hacking drivers are defective.