Comment by daveoc64

>I'd note my local park has such a rule, and the sign has pictures of what are and are not allowed, including a picture of a drone.

What happens if the sign in your park was made in 1995, when drones, electric scooters, and electric bikes didn't exist or were not commonly used?

It's not possible to list every possible vehicle in existence, and to keep such a list updated. There are all sorts of weird things like electric unicycles, that most people haven't come across.