Believe me there cant be a safe electric skateboard. I love skating but as a mobile transportation for commute it doesnt work. what works? Here I give two links for You about what is going On in USA. Me myself prefer to ride an ebike but e-scooters are pretty functional also. In NYC there is a good subway system and alternatives and thats why maybe not a good place for new things but tech culture centers Like San Francisco leading on new habbits.

https://spectrum.ieee.org/view-from-the-valley/transportation/alternative-transportation/welcome-to-the-scooter-wars

https://www.limebike.com/blog/data-backed-case-lime-electric-scooters-in-san-francisco