Earlier quoted context omitted.
Uber's claim is that black people are known to tip poorly, and so drivers would be incentivized to cancel their rides in favor of fares they expect will tip better. Therefore they don't allow tipping to prevent racism. Supposedly...
That is in no way true. Suggesting that black people are somehow to blame for Uber not allowing in-app tips is one of the most out there things I've seen on HN, and that's saying something.
https://www.bostonglobe.com/business/2016/04/27/uber-resists...