Wait, is that true? My experience with Uber drivers is they all bought a new car to be Uber drivers, sometimes with a loan Uber helps them get.
Uber being some kind of "sharing" economy company seems a little dubious. They are really quite different than AirBnB, which really is based on a surplus of housing.
Uber is mostly just a taxi company, and their fleet is all pristine, new cards, which they make drivers get and maintain. And the drivers are only "not employees" according to a very fine line.
It's more like the "1099" economy than the "sharing" economy. Uber isn't leveraging a car surplus - they are capitalizing on a worker surplus. There are no beat up old jalopeys getting "shared" via Uber. There is no natural, organic market, among people with/without cars.