The value proposition of a scooter service is ad hoc last mile transport where you don’t have to have brought the scooter with you to use it.
There may still be issues with the model. It might be that isn’t a demand profile that has the right scale to support much of a business (but could be useful for municipalities to provide, like some do with bikeshares). And I find rideshares are price competitive for last mile stuff (though it’s well known that’s only because ride costs are subsidized with investor cash, so maybe all scooter shares have to do to find their market niche is hold out til that stops). Or maybe most people feel safer with other forms of transport.
But the basic “summon something better than walking without having to carry it with you” idea does make some fundamental sense.