Just this week in Vantaa, Finland three 12-year-old girls piled onto one of those electric scooters you subscribe to with an app and proceeded to get run over by a car at a crossing, killing one of them
The app is supposed to have an age restriction but it's easy to bypass and you're not supposed to have more than one person riding on one, which people routinely ignore
I hate seeing kids and teens speeding around dangerously on those fucking things and then just leaving them laying around on high-traffic bike routes because they don't give a shit since they treat the scooters as completely disposable
Fucking awful bazinga-brained Silicon Valley-ass idea and business model. Actually, there are also bikes you can use with an app but curiously you don't see kids doing reckless shit with those, almost as if electric scooters were uniquely terrible 
"if everything was gumdrops and candy we could have sensible transit infrastructure and a healthcare system that covers injuries but here in real life we have to privatise the sidewalks with unregulated scooters that don't include a helmet and regularly injure people and bankrupt them with hospital bills."
China's transportation infrastructure and layout environment is very different from that of the west, with dominant public transit, relatively low car use, and significant usage of bicycles and other emobility systems. Inserting scooters into the mix is easier in that case.
Just dumping them onto sidewalks where they get in the way of pedestrians and wheelchair users, and then having riders only options being either getting sideswiped by cars in the road or bombing past pedestrians on sidewalks isn't safe for anyone. Ceding the last semblance of public space in the west to private corporations is not acceptable and justifying it under the guise of "well it's not like the government will implement a functional system so we have to let private companies do it" is a neoliberal talking point.