I think ad tech is probably the single most destructive technology of the new millennium. The shift toward "engagement at all costs" business strategies is basically the root cause of societies current political polarization. Engagement bait cultivates fear and rage in the populace to get clicks. We are now seeing the consequences of shoving ads that sow fear, anger, doubt and inadequacy into peoples faces 24/7. This doesn't even touch on the fact that mass surveillance is only possible because of the technologies forged by the Ad tech industry.