As Jared touched on I believe all 4 companies mentioned (Uber, Lyft, Tesla, Zipcar) are all "world-dominate-y" ideas, they are just in different categories.
In addition to the "can't find a cab" problem, Uber & Lyft sell experiences. This user experiences will be their biggest asset as they expand into other cities.
In addition to the "can't find a cab" problem, Uber & Lyft sell experiences. This user experiences will be their biggest asset as they expand into other cities.