Uber's complicated, messy history with tipping

What's one problem Uber has that's just the usual level of upsetting, and not totally horrifying? Tipping. 
The ride-hailing giant has for years stood strong against letting customers tip their Uber drivers within the Uber app. Lyft started letting riders tip their drivers in 2012, and Uber still hasn't gotten on board. The issue has been one of the stickiest for Uber's fraught relations with its drivers. 
Uber might finally be forced to change its tune after New York City's Taxi and L