We didn't need a license, by virtue of the displacement of the stock engine being small (IIRC the limit was 125cc? Or maybe even less). They also had to have pedals, so small motorcycles or vespa-style scooters did require a license. Or at least a registration.
The mopeds would barely go 30mph as sold. That was hackable though if you were so inclined and had a set of wrenches.
Yeah 49cc mopeds that aren't registered appear to still be a thing where I am (Boston). And I think it's 49cc 2-stroke so equivalent to like a 90cc 4-stroke (whether that ends up violating a different emissions rules, I don't know).
Still, parking is such a racket in Seaport, including unnecessarily strict ticketing on motorcycles, that I don't blame the delivery guys for using the mopeds. I'm not sure what their realistic alternative would be.
The mopeds would barely go 30mph as sold. That was hackable though if you were so inclined and had a set of wrenches.