>Obviously sarcasm, but as a non-car-owner I get a kick out of people freaking out about these scooters taking up public space. Meanwhile every street in the city is full of cars
There are laws for cars including but not limited to federal highways laws, state/city/county/municipal traffic laws and parking laws. Those laws authorize what you refer to as “leaving them around the city”, you can only leave your car around the city if it’s in compliance and authorized by the law, the Law often specifically penalizing leaving your car in certain situations (ex. in front of fire hydrants; in handicap spaces without permits; in traffic lanes). Their are no laws blankety authorizing scooter companies to adbadon and/or sell their products/goods/services on public sidewalks or roadway. Generally speaking most states/counties/cities/municipalities will have laws specifically prohibiting the same subject to various penalties without prior authorization, permits, etc... consider the number of stories in recent years about kids lemonade stands being shutdown and fined for operating without licenses.
Depending how old you are you might remember pay phones, phone booths, or coin operated newspaper stands...definitely you are probably familiar with atms and vending machines. What if a “tech startup” just started cluttering streets and sidewalks with those. That too would be illegal and not at all similar legally to cars being “left around the city”. Maybe another example is farmers markets, think if a “tech company” just started setting up farmers markets wherever they wanted without prior authorization.