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Comment on Sainsbury’s boss defends decision to sell customers’ Nectar card data

mannycalavera@feddit.uk ⁨10⁩ ⁨months⁩ ago

Create anonymous UUID, store interactions against this in a separate table, ensure PII is removed prior to storing. So instead of Max Reboo has purchased a subscription to jugs and hooters it’s user 12345678901234576 has purchased jugs and hooters. How can a future treadmill de-anonymise this? For sure if the storage is done badly then you can track back to a particular user.

Also, once again, can you link to the netflix issue you quoted above please. Thanks.

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Primarily0617@kbin.social ⁨10⁩ ⁨months⁩ ago

Create anonymous UUID, store interactions against this in a separate table, ensure PII is removed prior to storing

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

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