Until now Uber has insisted that your decision to tip – and how much – cannot affect the rating you’re given by drivers. Drivers have to rate you first before they know what tip decision you’ve made.
Tipping wasn’t even a part of Uber until recently. The idea was ‘the price is the price’ and indeed at the outset they contended that the tip was included. However in their quest to redeem their image, in part by accommodating drivers, Uber added tipping inside the app. At least Uber’s tipping has become cashless.