The scooters are a serious nuisance over here in Stockholm. I wish they were forbidden. But even the regulations that exist are regularly broken because the police don't enforce them.
There is a legal cap on top speed and effect (watts), but even within those limits, the scooters are too fast, and the bikes that sell the most exceed those limits and are used illegally without any checks.
I see people break other regulations all the time, and almost never anyone wearing a helmet.
There are several rental companies, whose scooters get parked everywhere: the companies know where they are from GPS and telemetry and who used them but don't do anything to punish bad behaviour.
The biggest problem though is that people don't tend to view them as being a vehicle, and are used by people who seem to be new to the concept of operating any two-wheeled vehicle.
Because they are standing up while using it, they don't even seem to think that they are operating a motorised vehicle but instead are like pedestrians -- just faster, and infinitesimally thin so they try to get into gaps. They often use the vehicle on walk-paths, and pavements/side-walks, with no regard for traffic laws and regulations.
For some reason, the richest neighbourhood in Stockholm has also got the most accidents per capita. Because there is where the most arrogant people live, perhaps?
A bicycle with electric assist for getting up hills is a completely different thing.
