Large predators can get swarmed by ants in some markets. After some thought on the point my uncle was trying to get across, I suspect the hire car market is one of them. Look at the bloat of Uber. If you don't try and own the whole thing but wrote an app that gave the functionality of uber to the existing cab and hire market, you could probably run it on a shoestring.
edit - basically I think whoever works out the craigslist version of Uber will eat Uber's lunch and it is quite likely someone will.
edit - basically I think whoever works out the craigslist version of Uber will eat Uber's lunch and it is quite likely someone will.