"Revenue" is confusing for business like this. More precise reporting usually reports either "GMV" (gross marketplace value, all the payments Uber took in) or "net revenue", which would deduct the amounts paid to drivers. If an article said "revenue" without further qualification and it was a marketplace business, I'd probably assume they were talking about GMV.
"Profit" is to some extent a fiction of the accounting department -- the relevant question is actually cashflow. Money in, money out. When you need to make a payment for loan service/payroll/etc and don't have the cash, you're headed for bankruptcy; that's pretty easy to understand. By way of comparison, whether or not a firm is "profitable" requires making a bunch of complicated judgments about whether you've actually "earned" the cash you've collected (e.g. gift cards, multi-year software contracts) and on the expense side, how to spread the cost of large, long-term, fixed assets (like code development, PCs, etc) against what they productively delivered (revenue-wise) over long timescales, potentially decades. That's called depreciation and amortization and it's a big topic in accounting school.
One thing many developers forget is that customer acquisition, especially in marketplace businesses like Uber, DEVOURS cash. Uber spends like crazy on everything from conventional advertising (digital, TV, radio), referral/sign-up credits, rider incentives, cross-promotions with other brands (stay at X hotel and get uber for 10% off), etc.
Uber is uniquely complex because it's sort of an aggregated conglomerate of a bunch of markets with differing stages of maturity and profitability. Think of each of these as different businesses, where the older, more developed (e.g. Chicago, New York) ones are putting cash into the business, subsidizing the spend (investment) on developing a good competitive position in later markets.
And yes, there is absolutely truckloads of money available if you can show you can reliably acquire customers on a business with good economics.