I'm skeptical, as one who hasn't cash tipped since they added tipping in the app. I'm 4.68 or so, after many hundreds of rides. Sometimes my rating drops, though, and I struggle to recap events to figure out why: he got mad because I asked to turn down the radio? He thinks I'm mad at him for making a wrong turn? and so forth. But since one of the main draws of Uber is the cashlessness of it all, I bet that's old r/uber news.