I haven't travelled as much as I did pre-pandemic. But my sense is that, even in US cities where escooters were big when they first came out, you don't see them a lot any more. And things like hoverboards are pretty niche--again based on what I've seen.
One Christmas several years ago everyone got hoverboards, but haven't seen one since. Possibly their batteries died, otherwise it was one of the quickest fads I've ever seen. Must have not been practical on the sidewalk. The wheels were very small.
