There are economies of scale, but there are also people who don't know they're going to go out of business for undercutting the major rates. And there will be

There are economies of scale, but there are also people who don't know they're going to go out of business for undercutting the major rates. And there will be people who bought a self-driving car et voila, someone pitches "AirBNB for self-driving cars!" and they decide to undercut Uber to make a few easy bucks. There will be constant downward pressure on price and no structural way to build a moat against it.