AI Ads 2026: Google AI Mode, DV360, and the Trust Fight

AI advertising is the use of machine learning and generative AI to plan, buy, deliver, measure, and protect digital ads. By the end of September 2026, it is also the most consequential story in marketing technology, with Google, Microsoft, and the industry's measurement bodies all making simultaneous moves that reshape how ads are bought and sold.

The week of September 28, 2026 produced three headline advances and two serious warnings. Google expanded AI Mode information monitoring to every user worldwide, introduced Gemini-powered vertical video buying in Display & Video 360 (DV360), and Microsoft opened more granular brand-safety controls to every advertiser. At the same time, a reported Google Ads scam campaign exploited fake security alerts, and new reporting raised fresh questions about how AI systems leak user data. Any serious look at “AI ads” in 2026 needs to account for both sides of that story.

What is AI advertising and why does 2026 look different?

AI advertising is the application of machine learning, large language models, and automated decision-making to plan, buy, personalize, measure, and protect digital advertising. The concept is not new; programmatic platforms have used algorithms for over a decade. What changed in 2026 is that the major platforms are now building generative AI directly into the ad stack instead of treating it as a back-end optimization layer.

The strongest evidence of that shift comes from an IAB Europe survey covered by Digiday's coverage. It found that 86% of companies now use AI for marketing, 59% apply it to programmatic optimization