Saying that we're going to work to dominate a low-margin sector at a staggering loss for years, so that we can enter an even lower-margin established industry and recoup our losses there, is a gutsy proposition.
Lots of taxi companies have their own apps at this point.
Pretty sure AWS was profitable almost from day 1.
Uber has nothing remotely like that and, unlike Amazon, their costs scale linearly and their workers (who are most of the business) have no reason to be loyal.