But they're our streets
Scooters are -- to use traditional English parlance -- a "Mechanically Propelled Vehicle". As such they're regulated by the state's Department of Motor Vehicles. The DMV isn't as anal about tagging everything with a motor as a formal motor vehicle requiring plates, registration and what-have-you but its still a vehicle that's being used on public roads. Our roads. The city isn't being unreasonable monitoring them; they' ahve an interest in local traffic and an organization, LADoT, that manages it (you mostly encounter it giving out parking tickets but it does do a number of other things).
If you desire scooter privacy then scoot in your own private space.