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 
People don't return them because proper scooter stands don't exist lmao. Bike share systems actually have physical infrastructure showing where you're supposed to return the bike. I worked for one of these scooter companies, "proper parking" was just somewhere on the sidewalk that isn't obstructing traffic. These are solvable problems, not something inherent to electric scooters.
I'd be happy if people left them on the side of the road but no, it's always on the road where they often proceed to fall over and block the path even more