I use my debit card for my everyday purchases. A certain large bank knows where I am because of where and when I buy gas. They also know where and when I eat out. Krogers knows exactly what groceries and sundries I buy as I use a loyalty card to get sale prices. A large insurance company knows my and my entire family's medical history and what prescription medications we take.
Everywhere I browse on my computer, even without logging into a website, gets me location focused ads. The phone company has a record of who calls me. My cell provider has the same, and My Location on my cell phone tells Google know where I am. My travel rewards program keeps track of how often I travel and where I go most often. My homeowners and car insurers know what my house looks like and how well I drive.
If I can get a few discounts from Amazon because they know what books I have on my Kindle, then bully for them. They aren't actually spying on any individual (unless you are targeted by law enforcement); it's just another way for them to gather marketing data.
Face it, there ain't no such thing as privacy unless you live off the grid.