It would make for an interesting project for sure. How much of this is actually drive train components for many scooters anyway? An old worn out
scooter might than be given new life.
I'm curious about the weight limits, torque and horsepower. Some people might be too heavy for these motors.
How about using this for making a generator as well

A converted electric car could use it as a slave to some degree also.
It could be used for some several interesting projects. The prolem is probably the quality/durability of this drive train.