You know it had to come eventually - banks know what you buy with your debit and credit cards and that's information that can be sold! It's a bit sad as ads will intrude into yet another part of your routine. And again you didn't ask for it, but you'll be getting it all the same. Cardlytics (CDLX) works with banks to develop promotions and coupons for customers based on their purchase history. What you buy is a great source of information about what you might like to buy in the future - especially when offered . . .