Reciprocity with credit cards is a thing too. It's how Amazon was able to re-target me with a product carousel for something I impulse bought at a Macy's. I'm

Reciprocity with credit cards is a thing too. It's how Amazon was able to re-target me with a product carousel for something I impulse bought at a Macy's. I'm not really complaining but even tech savvy people can underestimate just how much of their information is out there.