this post was submitted on 03 Aug 2023
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The ToS and privacy policy will give you an actual answer. Generally, you are having all of your purchases and stuff tied to your name, age, gender, address (approximate or specific maybe), and other demographic data. This data is then used for a variety of purposes running from actual research on trends and such to targeted ads, to who-knows-what. Basically you and your data are the product and you get points for being so.
Grocery store cards were one of the early adopters of this sort of thing, IIRC.