Same in Italy. That's a different license than taxi. Those drivers should go back to their base, possibly very far away from the end of the previous drive, and wait for another call. Taxi drivers complain that the ones working for Uber don't but I don't know the details of the fights of the last months. I use car sharing services and getting a taxi here is easier than installing an app (call a phone number, somebody answers), so I never used Uber and I wasn't that interested in this drama. I expect Uber drivers to go on strike and block streets like taxis did weeks ago. Obviously cheaper taxis would be a great outcome.