Uber are breaking records in building a business segment from scratch over an incredibly short span of time. They have been taking investment in order to grow fast. That's reasonable because (1) they have been able to use it to grow fast and (2) this is a business that probably tends to the winner-takes-all end of the spectrum.

Is it riskier than ExomMobile? Yes. Is it a nonsensical investment no? Will they be harmed if all finance markets dry up completely. Yes. Would it kill them? Probably not, but who knows. But, the only reason for a tootle dry-up is if the fundamentals are totally broken, and there is no reason to think they are.

Uber generates revenue. It's business model is pretty solid. Customer like it. This is nothing like the 99 companies.