Plus, when Teslas are usable as self-driving cars, the value of the rides provided will drop precipitously -- that figure would be more like $5000, and you'd have to lock up usable hours for it and perhaps pay some penalty to renege on specific hours.
People who hire robotaxis might need to have money in escrow if they don't have enough reputation.
Lol
If you try to rent a car without a credit card, you are usually required to put down a deposit.
Renting a car requires one, but there's also more generally a high barrier to renting a car - plenty of forms, showing your license, booking in advance, etc etc. There's also no choice. The same is not true for getting in a taxi. Why would I put down a deposit to ride in an automated car, really?
I could see competing products (Apps) with less infrastructure launching this business model though. So I guess it might exist in one way or another in the end.