Not all, but some of 50 cc is "mopeds" - old-style name derived from motor+pedals. You start engine by pedaling
Know those light 2-wheelers called "mofa" in Germany? Or "Class A"?
Those are same - there is no kick-starter, pedal along and it will start engine.
Lots of kids in Europe using those to get around. Top speed of 25 kmph means you do not need to have any driver license.
Very popular in Belgium method of transportation. Peugeuot Vogue, Honda Camino etc. etc. still being built and sold in shedloads.