But it's okay for them to be littered by cars?
Nobody is "littering" the streets with cars. You just don't agree with the specifics of how the government has allocated the physical space resources under its control so you see it that way.
Don't get me wrong, I'm definitely on Team Ban Cars. But I think that recent unregulated dockless schemes have demonstrated that access to street/sidewalk space is the limiting factor for these companies, and it's sensible to restrict this access somewhat.
We have a docked system already but Lime scooters litter the sidewalks all over town. Why not remove a few car parking spots and require scooters be parked there? One spot could hold many scooters and keep them off the sidewalks.
London for example are phasing in stricter low-emission areas, which should technically mean less cars will be passing through. Eventually, they could re-purpose roads so that the primary function of them is for pedestrians, bikes, bike/scooter storage etc rather than 4+ lanes of car traffic.
That is why I believe it is temporary anyway, it seems natural that cities will head this way.