Well, Yellow Cab could hardly even get credit payments to work in their cabs, so they are not exactly a technology company. It's not going to be easy for a cab

Well, Yellow Cab could hardly even get credit payments to work in their cabs, so they are not exactly a technology company. It's not going to be easy for a cab company to clone what Uber (or lyft) have built during the last 7 years. Plus Uber has a network of drivers/users that has significant value.