What do you think, most such data comes from Apps, they just ask for permission and give you no rights at all. Location data is a such business, for traffic or business. Look at this example from Thasos. The look many hours and shifts are in companys and sell the data to traders.
http://thasosgroup.com/blog/thasos-data-tesla-wsj/
I did not say, I think it's a good thing or it's ethical. It's just the truth. But we all accept it somehow, so Google or wherever can make us good traffic warnings. Here in Switzerland the location data is also sold by the telco companys, you have to opt out by yourself (at least by Swisscom).
