The problems with these are:

• People parking them in places that create obstructions or dangers to others
• People riding them irresponsibly in shared spaces with pedestrians and cyclists

They're basically a motorcycle in non-motor spaces, which creates major safety problems. We have the same problem with "fatbike" ebikes in the Netherlands, where they're super chunky and being driven by novices (youth) who create risk to others.

It's nice to have alternatives to driving, but these are pretty poor alternatives. Also, they tend to only exist in tourist areas and tourist cities, meaning they aren't actually useful for residents.