I think that electric motorbikes are at a point where they are better value for money than e-bikes as well as more capable. Depending on where one lives and the bike's power, some don't require a license or only require a driver's license. The main makers have more R&D capability than e-bike makers, and benefit from better economy of scale.
I don't see the point of an e-bike unless you're a dyed-in-the-wool bicycle rider who wants pedal assist. I also think that a lot of the people who want pedal assist are having trouble coming to grips with what they really want and/or, if they live in a strict licensing jurisdiction, are intimidated at the thought of getting a motorbike license
Here in New York City, inexpensive versions of these motorbikes have become the vehicle of choice for restaurant and other deliveries. They are everywhere, to the annoyance of some New York residents They are less expensive than most, if not all, of the e-bikes mentioned in this thread.
Going up a notch, Piaggio is in the process of launching the Piaggio One in three versions, one of which is legally a moped (photo below). On price, the basic Piaggio One costs about the same as the higher priced e-bikes discussed here. They are a less expensive follow-up to Piaggio's Vespa Elettrica. Price is no doubt one reason why Piaggio's first rollout of the new bike is in India.
At the high end, and to take one example, California's Zero Motorcycles makes highly regarded electric dual sport bikes as well as street bikes.
For eight months in rural Sicily, I rode a Piaggio Liberty scooter as my sole means of transport. I mention this because a lot of people think that scooters are only good for city streets. Not true. It depends entirely on how high the bike is off the ground, which in turn is about wheel size. The Liberty, with a wheel size much larger than the wheel on a scooter like the Vespa, got me everywhere, including through farm fields and up and down Sicily's steep dirt roads. I haven't looked at the Piaggio One's specs, but the wheels in the photo below are clearly much larger than Vespa wheels.
Piaggio One:
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