> Why would you, when it's cheaper to ride around in someone else's?

As if there's zero risk associated in getting into someone else's car...

Not to mention any vehicle I willfully own will never barrage me with advertisements or surveil my movements.

Uber is burning billions of dollars in an attempt to corner the market. When/If they succeed, do you really think they won't put the screws to the customers living in circumstances where car ownership has likely become all but impossible?

The prices will shoot up, the monetization of the personal data will increase, the in-vehicle advertising will increase, the whole experience will become worse than what the end-game of yellow cabs looked like.

I fully expect the self-driving Ubers of the future to partner with the police in arresting people. You get in the car you ordered, it knows your identity, it reports all rides to the police system, if a boolean comes back true, the doors lock and it drives you to the jail entrance for processing. It's just another revenue stream.