Credit card privacy matters: Apple Card vs. Chase Amazon Prime Rewards Visa - The Washington Post

When you start looking at where your activity is tracked, it seems like there is no end of it.

What I learned: The card data business is booming for advertisers, for aiding investors and for helping retailers and banks encourage more spending. And there are many ways a card swipe can be exploited that don’t always require a transaction being “sold” or “shared” in a way that fully identifies you. Data can be aggregated, anonymized, hashed or pseudonymized (given a new name), or used to target you without ever technically changing hands.

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