[Moderator edit to conform to deletion of original quote.]

1) I am more likely to tip if it were offered in the app. Uber doesn't offer it. Almost all taxis and ride share platforms (including Lyft) offer a way for customers to tip without cash. Uber is behind the times if they expect their customers to tip.

2) When I first began to ride Uber, I was under the impression that Uber rates were high enough to essentially make a driver whole without getting a tip. Uber has since slashed rates to ward off competition and to attract new customers in kind of a bait and switch play.

3) Uber has consistently marketed its service as being cheaper than a taxi. When I start tipping, it becomes as expensive or more than a taxi. Again, a bait and switch.

4) If Uber really wanted to help its drivers, it would reduce its own take rate on a fare and reallocate that money towards gratuities to drivers.

5) Tipping, and stereotypes about tipping, can lead to all sorts of discriminatory behavior on the parts of passengers and drivers based on all sorts of categories (race, sexual orientation, origin neighborhood, destination neighborhood, style of clothing, whatever). Uber as a service helped get rid of a lot of this. Introducing tipping, especially a cash only system, may reintroduce these biases.