50 or more years ago there was a thing called a 'moped'. A moped was a bicycle fitted with a small engine, up to 50cc, that assisted the rider in peddling but was not generally powerful enough to propel the moped by itself. Well, it wasn't in the original incarnation but then the Japanese came along and the moped became a small motorcycle, perfectly capable of reasonable speeds with no need to pedal at all. In the UK (I don't know about other countries) it was a legal requirement that a moped be fitted with pedals by means of which it could be propelled. There was nothing in the specification that said the pedals must be easy to use or convenient. UK mopeds had pedals, they were very awkward to use and you'd rather push the thing than pedal it. No matter, they complied with the law.
Now we have a new kind of moped. It's a bicycle and it's fitted with a propulsion device to assist the rider in pedalling, but is not capable of being entirely self propelled. How long before electric bikes become electric motorbikes?