A few years ago I was working on some bank software. We had access to bank's anonymized data, and I was really surprised when figured out what information is st

A few years ago I was working on some bank software. We had access to bank's anonymized data, and I was really surprised when figured out what information is stored with card payments. For instance, I learnt that a guy had bought a pack of cigarettes in a small town at 12:31, Monday. Then I realized how much information a bank may posses. And how dangerous it is, because we have no control on how and who process that info. That day I decided to pay with cash whenever I can, despite inconvenience. I prefer cards or bank transfers when buying expansive stuff, like a car, furniture, a camera, etc.