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Sainsbury’s boss defends decision to sell customers’ Nectar card data
(www.theguardian.com)
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this post was submitted on 13 Dec 2023
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which is more or less exactly what netflix did -> the whole thing's not that hard to find on google
but you need something to distinguish users at least a bit or the data's equivalent to sales figures
you combine that "not-quite-pii" with other independent data sources that have similar "not-quite-pii" and build a complete picture
the treadmill effect comes from active research in this exact area trying to de-anonymise data sets finding new techniques to get around old ones