Comment by whistle650

This is the key point. Ads and clicks etc are priced in a competitive market. If they don’t deliver the ROI because of bots, then people (including the allegedly hopelessly confused e-commerce retailers) would pay less for the same amount of traffic. It may be annoying (and the cost of dealing with that annoyance would further drive down the price paid for the traffic). But what matters is that an e-commerce site is profitable (enough) after the ad spend, period. If they are not, why do they spend what they spend on the ads?