Federated learning means that I can learn and that I can share that learning with others. When it comes to data about me, the elephants in the room are the data brokers. They are the entities, mostly hidden from us as subjects, that set the value and profit strictly from brokering data about me to what I would call the principals. Principals are the entities that I actually want to do business with, airlines, auto manufacturers, publishers, pharmaceutical companies, Lyft drivers,...