I would have thought that they know enough to make a decently accurate guess. Not that I know what they do of course, but without much thought I can think of a

I would have thought that they know enough to make a decently accurate guess. Not that I know what they do of course, but without much thought I can think of a model that would allow me to predict income. - They're using Uber, that cuts out a decent chunk of poor people. - What areas do you visit and at what times? - Property prices in those areas, are they workplaces or urban commuter areas? Can likely predict value of someone's house if they use it from home. - Type of Uber taken - Size of tip - Frequency of travel - etc. etc. I reckon that given some time and some people's ride data I could estimate their income, house value, and even perhaps job. I would guess Uber have done this and then some. Of course it's not going to be 100%, but Uber don't need that.