The speed limiter is an issue if they are used on the roads. 10mph downhill is just stupid.
The e-scooters that I've seen being ridden inconsiderately have mostly been private ones (usually derestricted), not the pink Voi ones.
Cudzo - helmets are recommended by Voi, but with all these hire schemes (bike or scooter), people don't have a helmet with them - the whole point is that after a few seconds fafffing with an app you can just jump on and go wherever you are.