> The author's point is that, with the data available to the platform owners, they could easily deduce the subset where that P value is nearly zero (having alr

> The author's point is that, with the data available to the platform owners, they could easily deduce the subset where that P value is nearly zero (having already bought the mattress). Let's think carefully before we argue that Google and Facebook should expose (indirectly or not) even more of the information they collect to third parties.