I don't think this would be much of problem, as there is only snow on the streets of NYC for a few hours of a few days a year. The plowing/salting/traffic volum

I don't think this would be much of problem, as there is only snow on the streets of NYC for a few hours of a few days a year. The plowing/salting/traffic volume means that the roads are almost always clear, even on the mere ~21 days where there is snow accumulation in unused areas (like the parks). Most people in NYC don't even drive snow-capable cars, and on the very few days we have snow on the streets the roads are absolute chaos. You'd just mandate that the scooter companies disable the scooters when the city tells them to. The robust public transit system would mean that those who normally ride scooters would have no problem getting to their destination.