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One approach would be to require that a person/group/company that is aggregating information report the storage and use of the information to the people in the database.

You could have some arbitrary cutoffs, like don't worry about information on less than 1000 people or stored less than 3 months (or whatever numbers you want to pick out of the air, the point is that the threshold for reporting might not be 0).

What I think this might do in many cases is make storing the information more expensive than any value derived from it. It also gives people a chance to learn that the water company is sharing their usage with the police (or whatever).

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