They can't help. My friend sells second hand bicycles recovered from the police. A couple of weeks ago they gave him an e-bike. This thing had been modified with a twist throttle, 1 kW motor and a maximum speed of 62 MPH.
He took it up to 40 MPH (on his own private land) before chickening out. The chain would simply not stay on the cassette at that speed. He reckons that if you did drive it to the limit, you'd go through a brand new set of disc brakes and calipers in a week, if you didn't manage to boil half the hydraulic fluid off in the mean time!
But to a non expert this thing looks exactly like a regular bicycle--because it is (or was, before it was illegally modified to be a motorbike).
However, e-bikes can give unconditioned people “superhuman” strength and endurance. Physical training tends to give individuals intuitive limits for personal safety, but using a modified e-bike short-circuits this intuition.
I am thinking that limits on stuff like diameter of frame tubing or tire width (which would not stand up to riding at speeds outside of normal “human” parameters) can help.