Big Three Swallow 56% Of Ad Revenue. AI Will Make It Worse. Automation Favors Incumbents, Naturally.
Madison & Wall reports that Google, Meta, and Amazon already capture 56% of U.S. advertising revenue. The shift toward AI-automated campaign tools is concentrating even more growth among these three. More advertisers are migrating to automated buying, which structurally advantages the platforms with the most data. The full analysis is available to Digiday+ members.
This illustrates a principle I like to call the data flywheel effect. The platform with the most training data builds the best automation tool. The best automation tool attracts more advertisers. More advertisers generate more data. Notice the circularity. The mechanism is straightforward: AI does not democratize markets. It accelerates existing concentration because machine learning rewards scale of inputs. You cannot outautomate someone who has exponentially more data than you.
Madison & Wall published the analysis. Digiday distributed it to members. The findings are backed by actual advertiser spend data, not survey sentiment. The Big Three in question are Google, Meta, and Amazon.
- Go to Google Ads and create a free account. You will not spend money, but you need access to see the interface.
- Navigate to the campaign creation flow and select a Performance Max campaign, which is Google's fully automated option. Observe how little control you are given.
- Compare the available settings to a standard search campaign. Notice how many decisions Google makes for you. That reduction in control is precisely the tradeoff Madison & Wall identified. You trade autonomy for the platform's data advantage.