To be fair, there is no such thing as the free market. Markets only exist thanks to States. They have never existed independently of a state (I recommend the book Debt: The First 5,000 Years).

Now back to the free market, Uber is operating at a loss. They're undercutting Taxis and taking huge hits to keep their business running. That kind of pricing is illegal, and we've seen companies like airlines get into huge trouble for operating at a loss to try to kill smaller airlines. It's literally anti-competitive.

If the playing field were fair, it'd be different. But it's not. Uber constantly ignores laws on an international scale, under the name of "disruption." They might be laws you don't like, but they do exist for a reason, and somewhere you have to draw a line.