Same here. That's the main advantage of the service--that you don't have to horse around with cash and tipping or fumbling around with a credit card in the back seat while the driver waits. If they ever added the expectation of tipping, I would drop them like a bad habit. The fares are super reasonable and I would be more than happy to pay even a little more if it meant not getting guilt tripped over a tip. Tipping in America is total bonkers and I support any effort to replace every instance of it with 1. me paying the actual advertised price for something and 2. companies paying service workers a fair wage.