People get e-motos because it is effectively a motorcycle, except it doesn't have any road legality requirements. People treat them like bicycles that can just magically go 50mph.
Most people don't want a two-wheeler, period. Otherwise everyone would be riding motorcycles. People want a vehicle that will keep them dry, comfortable, and safe. Two-wheelers of all types fail at all of those things.
Motorcycles already did that. E-bikes or E-motos do not bring any advantages compared to normal motorbikes, so you shouldn't expect many people to switch.