Most ebike/scooter use is done in the street from what I've seen. Streets are the right place for ebikes, which are basically mopeds, though I don't think escooters are safe on the street for users nor on the sidewalk for pedestrians.

It would feel extremely sketchy to ride an escooter on the sidewalk with all the blind corners or entryways people are liable to pop out from.

The best thing you could do with an escooter is to do what bike riders do to be safe, which is to take the entire lane. Car's might get pissed and honk when they pass you, but its better to force them to merge into a separate lane to get around you, than to try to squeeze through the same lane you are in and force you into parked cars or the gutter.

Oh trust me, I wouldn't feel good about riding an e-scooter on a sidewalk either, they're too fast and it's a nuance to the pedestrians sidewalks are built for. But I also wouldn't feel personally safe riding an e-scooter on a street; the small wheels of a usual scooter make it inherently unstable at the sort of speeds the electric motor can easily propel it to.

Basically I don't think there is any safe and responsible way to use an e-scooter. I don't think they should exist, it's just a bad idea. e-bikes are great though.

Have you spent much time riding them? They are more stable than you might expect, they feel pretty good going at their max speed of 18mph or so.