Someone's tech salary was justified to develop (or refractor) a function to automatically crawl a digitally stored purchase history and waste potentially useful ad space on the suggestion of a product that is guaranteed to already be owned by the user.

Then they can put on their curriculum vitae that they worked as a "Googler" even though they added nothing to society (except confusion and paranoia).

Google may even allocate tax write offs because they "filled a seat" among their ranks.