Paid taxi service with humans at the wheel. It's not an autonomous taxi service until you can take the driver out.

Yes so the logical conclusion would be to scale that up, in whatever limited capacity it is currently serving.

How many places in the U.S. have the weather and traffic level of a region outside of phoenix? Maybe a region outside of scottsdale? They would scale if they could but that adds more variables that they haven't felt confident enough to tackle yet, otherwise you would see them scale this up and around the U.S.

Great example of no true scotsmen - we went from them not existing to "well they're not everywhere, so do they really exist?" in 3 comments