They burned half a billion dollars a month of VC money at their peak to undercut taxis across the world; in quainter times this used to be called "dumping", now it's just the standard way of doing business. All the while basically flaunting the law with their whole "we're just a platform connecting people who happen to drive a car with people who happen to want to go some place, it's totally not a taxi guys". No regulations, no expensive licenses or professional certifications, no need even for a minimum wage or basic social security or insurance or any kind of protection. Amazing!
Essentially the same in spirit as Airbnb, only this latter had far more destructive consequences than screwing over taxi drivers.