Snarky but inaccurate reply. They do if you're a resident of Phoenix. Prices are equivalent to Uber but it's still too early to conclude what's behind those prices. Are they sustainable at scale? Is it just to avoid having the price floor drop out from them if they're viewed as purely a discount option? Is it to dissuade having too many users on the system all at once?

The way you can tell if you're looking at a driverless car is to check and see if there's a driver in it.