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.
Yes you can still rent them in San Francisco and Oakland, but less than there were a few years ago.
Electric scooters are limited to 15mph, you can get a speeding ticket for exceeding 15mph even going downhill. And they aren't really safe to ride faster, they can't stop quickly. You need a drivers license. You are required to ride in the street or bike lane, not on the sidewalks or paths shared with pedestrians. Technically you can't make left turns in the road either, you need to ride straight across in the bike lane or road then stop and walk through crosswalk. Also not allowed to ride in a crosswalk at all, but many of these rules are not strictly enforced.
Compared to ebikes where the motor can provide power up to 28mph with pedal assist, up to 20mph with throttle only. No drivers license needed. Ebikes can legally use many multi use paths shared with pedestrians. No problems making left turns in traffic. No need to walk in crosswalks because you can ride on the road/bike lane. It isn't surprising they aren't as popular.
Here in LA the fad seems to have ended around the start of covid in 2020. I used to see dozens of people a day riding them and now I rarely see any, and if I do it's usually a personal scooter not rented from Bird, Lime, etc. I still see scooters from those companies clogging up the sidewalk, I just never see anyone actually ridings them.
You definitely see fads with things that aren't terribly utilitarian for getting from point A to point B. Inline skating/Rollerblading was very popular at one point and now it's rare to see anyone doing it.
Bird, Lime and Spin are still operating throughout the US but the market’s stabilized over the years; you don’t see tons of new stock or them dumped absolutely everywhere and they’re less of a novelty now, most cities have gravitated towards one or two of the major companies while the others have pulled out and concentrate on other locations.
The share programs didn’t really take off in the north-east, but I see a lot of personal e-scooters in NYC. (I just got one myself and it’s a great fit for the city)