Start a site or a place where you can collect metrics and hand out cookies. Boom you're in the surveillance game. You can buy ad data, you can read census data, if you have the money it's all out there on the market. Hell if you don't have a conscience you can buy black market info.

You have to ask if you want more of that until we reach parity with Google and THE POLICE, or if you're reacting out of a sense of fairness that's taught to children.