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Depends. I got $360 in free groceries last year at one place so I think that was a fair trade.

At the other store in town I got about $150.

Better pay than I get for my privacy on the web.

Hypothetical example: and what happens when your insurance company buys this data 10 years down the line, sees that you've buying an awful lot of sugary soda very closely in line with people at risk of diabetes, and decides to increase your monthly premium?

This is my favourite example of a consequence of loss of privacy. I've found it to be incredibly efficient at convincing even non-tech people (like my family) to be privacy-aware.

Then we as a society should decide if pricing people differently based on this kind of data should be legal (in my opinion it shouldn't for social insurance). But the probability that you indeed have a risk for diabetes is higher than if you'd only have bought broccoli.

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