Scooters are only truly safe in a separated bike/scooter lane, so given that cities have to invest in that infrastructure, they should ban Bird and others and only allow their own bike/scooter systems that are integrated into their own public transportation networks.
Cars are only safe in a separated car lane, so why not ban cars, remove the car lanes and transform them into bike / scooter lanes ?
Because streets were designed as car lanes, and bikes/scooters are niche transportation technologies [1] when compared to cars?
[1] Bikes and scooters are really only useful for short-distance individual transport. They do not handle long distances, groups, and cargo very well.