You see them here and there in the eastern US. But many cities don't allow the rentals. Even in those that do, it seems they were a fad for a while and now they're pretty occasional. Once the novelty wore off, there isn't great infrastructure for them in a lot of places and the cases where they're genuinely useful as a transportation option is pretty limited. When they first came out, they were scattered all over the place in Raleigh for example but last time I was there, they were few and far between.