There are many things advertisers don’t know about how cookies — the backbone of programmatic advertising — work. One of them being how they’re obtained. It turns out pretty sneakily on occasion. According to a recent audit, a large number of cookies used to target audiences on the 1,000 biggest publishers in Europe are done so without the consent of the person who would see the ad — a problem because this shouldn’t be happening since the arrival of a wide-ranging privacy law four years ago.
