No, you clearly have never talked to the workers at Uber (no not the devs, the drivers). Uber has disgustingly fought against unionization efforts, employee benefit efforts, and increasing wages. Such actions do not make you a good company, especially when the executives make millions while fighting against workers wanting a better life.
They are an evil company and the rot has been there since inception. This isn't even getting into their disgusting internal predator culture against women either.
Yes, but that's loss leader rather than capital investment. You can't put a customer on the balance sheet and depreciate them. Once you've paid for a free ride, you own nothing tangible.
It is a large enough number to simply run out of private capital to consume before it turns cash flow positive.
Lots of things sell well if sold at such a loss. I’d take a new Ferrari for $2500 if it was on offer.