That seems like a highly questionable statement demanding some evidence. Perhaps you meant if they retrenched into existing markets while raising prices and laying off all of their business development staff?
[1] https://techcrunch.com/2018/02/14/uber-could-be-profitable-i...
So Uber is charging their current rates as a way of giving back to the community or whatever? If Uber (or even Uber and Lyft) were to double their prices tomorrow there would most certainly be a drop in volume. Just a couple of days ago I took a Lyft from the airport for no other reason than that a cab would cost about 2x. Yes, there are also circumstances and places in which Uber/Lyft is demonstrably better than a cab but the decision can also just be about who is cheapest.
Even that wasn't enough money. Uber recently borrowed another $2 billion at 7.5 to 8% for 5-8 years.
[1] https://www.crunchbase.com/organization/uber/funding_rounds/...