Waymo has employees watching their cars and resolving issues when they come up. So in order for Tesla to do robotaxis like that, you will now need to pay Tesla do to the monitoring and issue resolving as well. And then of course you will need your own special business insurance without the bulk purchasing power of Waymo/Cruise. When your car gets into an accident, you don't get to replace it with one from Tesla's fleet like Waymo does, you are just SOL.
1: Tesla can use their own cars. They dont't need to base the service on the cars owned by individuals.
2: If they want to rent cars from individual owners, they can make the conditions as comfortable as needed. Monitoring and insurance for example would most likely handled by Tesla and not be paid by the individual owner. The owner would just get a fee for every hour Tesla uses their car.
