That has happened already, although for human driven vehicles. Yandex taxi was hacked earlier this year and all taxis were made to go to a certain location, cau

That has happened already, although for human driven vehicles. Yandex taxi was hacked earlier this year and all taxis were made to go to a certain location, causing massive traffic jams. In practice, if companies have these kinds of issues regularly, it'll be similar to how scooters and dock free bikes have been rolled out: they'll be allowed initially, then the city officials will kick them out if they're causing more trouble than they're worth.