Data brokers collect lots of data about most people, including location data that they get from snoop phones, apps for sapps, and web sites and use machine learning to identify patterns in that data and what the patterns mean. The FTC is suing individual data brokers and making them agree not to do these things in the future.

It is a brave effort, but when one company stops, another will pop up to do the same thing. To make privacy secure. we need to require products and services to be designed so that they don't tend to track anyone.