To those who use those rewards or membership cards for points and/or discounts. That data is collected and sold. One of the buyers was a county in the state of Washington who used pet related purchases to issue citations to those card users and residents for not registering their pets.
http://komonews.com/news/local/king-county-using-grocery-store-data-to-target-pet-owners
It's simple: discount or privacy
http://komonews.com/news/local/king-county-using-grocery-store-data-to-target-pet-owners
It's simple: discount or privacy