I agree with the author that it is super annoying when you are assaulted with ads for the things that you have bought recently.

If you have bought them recently, they are the most unlikely things to buy in the near future.

I was actually surprised a few days ago when I have seen for the first time in many years a personalized ad that was useful. When I visited an on-line shop, I was greeted with a message that a product at which I have looked during a previous visit, but which I have not bought, has a 20% price reduction, and at the new price I was indeed interested to buy it.

This kind of notification, about a price reduction, makes sense, but ads for products to which I have looked previously and nothing has changed about them do not achieve any useful purpose. If I bought them I have no need to buy them again, if I did not buy them, this means that I decided that I do not need or want them, so I will not buy them regardless if I see ads for them.