Log onto Facebook. Before you know it, you’ll see ads from Temu or Wish, pitching cheap products. Or open your old email account, the one that you’ve had for years, so it gets the most spam. Every other message is an offer from some unknown store, selling the sort of thing in which a person like you just might be interested. Or log onto Amazon and look for something, anything at all. Twenty percent of the hits, maybe more, will be “sponsored” items, often from a brand you’ve never heard of. Of course, you can shut down the internet, close...