Don't forget the fact that you can be randomly stopped and forced to provide documentation that you're legally required to carry in order to operate the machine... Unlike a bike, which you can just ride wherever.
Oh... And yeah, and most bikes don't have computers in them that can tell on you to the cops if asked.
I mean I think in my state you still have to have iD for some reason while biking, also it's illegal to ride on the sidewalk, which everyone still does but if a cop forgot his donut that day he's got a reason to hassle you