[usrusr]

> I only care about availability and price.

If Uber reached the critical mass of creating gridlock almost exclusively consisting of (idling) Ubers, an idling competitor two blocks away would not win the availability metric for your next ride. Unlikely to happen, except maybe in a few particularly overrun city centers, but that's one way they could do it. (Can't think of a different one, I don't believe that they will win their bet)