I get it, this is cool and there is limited use for these. Perhaps you can rent these instead of jet skis or snow machines or off road vehicles in the backcountry. However, there's no way this is mainstream transportation. As a motorcycle...
When I was a little kid, I had a RYOBI Drill, which had a slightly squeaky motor. I unbelievably liberally poured motor oil into the old brushed can motor. Guess what?? It smoked terribly when in use. Still does that to this day, years later😅