Comment by chillingeffect

Or maybe parallel construction used to deny/approve loans. E.g. I can't weight the loan approval negatively specifically bc the person is black, but the GPS information suggests they frequent black areas.

But really every use of this information is highly assymetrical. If they're using it to trade stocks, while regular people are using traditional means, it's an advantage we don't have access to. This is basically the virtual castle walls keeping us peasants out in the fields. Modern feudalism.