With a 60 billion + valuation they probably could easily afford it.

I'm sure someone will make a ridesharing app for private owners of self driving cars to rent them out when they are not using them, though. The app maker would have to insure against damages, and the long term trend will be towards transportation as a service where you subscribe to a self driving car company and just get a car on demand rather than having one idle in your driveway, but some people will cling to private ownership and might use it.