That's hilarious, but more than likely that's exactly what happened. I listened to someone explain the process on a podcast recently, can't remember which one maybe the Vergecast or vox today explained. But the example they used is you go to a country club you hang out with a friend who just bought a Porsche or whatever. They use your phones location to know you are always going to this location and sticking within a few feet of this other phone, the owner of which has the new Porsche. Well they figure that's your friend and he's probably talking up his porche, and your in the right demographic to buy a Porsche and you haven't bought a new car in x years, so guess what now you get Porsche ads. So what you described perfectly fits that example, they figured you'd all be suckers for some totes.