Makes you wonder why no one has built an app that interfaces with all of them, and finds you the cheapest rate, while taking a kickback.
They did (well, it at least has multiple Uber and Lyft services, and I don't know that they get a kickback); the app is called “Google Maps”.
I guess the plan for Uber was always to use low prices to win the market and jack them back up later. Price comparison would interfere with this plan.