[yummyfajitas]

The uber post almost certainly did not violate anyone's privacy. They ran a bunch of aggregate queries that probably dropped any pii pretty early on. They did not publish a list of riders who took a ride of glory.

(I say they "probably dropped PII" because when you do work of this sort, PII is boring data that slows down your calculations.)

Similarly, what's wrong with observing a correlation between welfare checks and prostitution? It's an interesting observation. It's potentially useful for public policy and fighting poverty (at least American style relative poverty), though of course a more detailed investigation needs to be done.