The endgame for Uber isn't to eventually hit profitability as is, nor is it to use your data to enhance profits. Their current mission is to claim a monopoly on the ride-share business by taking heavy losses at the moment (while running Lyft out of business), and then transform as soon as possible to an autonomous driving company where 1) they will develop a fleet of their own self driving cars, taking the need to pay drivers out of the equation, and then eventually 2) allowing you to 'rent' your vehicle to Uber to use as a ride sharing car while you're sitting at home or at work, taking the need for them to buy their own cars out of the equation. At that point they'll be insanely profitable, but they'll also have created a system that greatly reduces the requirement for car ownership, which could actually be considered very mustachian.
The ethics here aren't really about exploiting drivers, They're about the age-old tactic of cornering a market by undercutting prices. If you don't like what Uber's doing, you should definitely be boycotting Amazon, Walmart, and probably every other mega-corp out there.