Retail invalid ad traffic hits record 5.54% in Q2 2026, Lunio reports
Lunio CEO Nick Morley attributes the increase to retail's shift into automated, machine-managed campaign types faster than any other sector the company analyzed. Google is rebuilding search around AI-driven query matching, he wrote in the report, handing more of the decision over which searches trigger an ad, and where those ads serve, to automated systems. Performance Max and Shopping campaigns now run most of Google's ad volume, and within AI Max search campaigns specifically, invalid clicks made up 68% of the total. Lunio also pointed to the falling cost of AI-generated fraud: a synthetic browsing session that mimics a plausible click pattern and passes basic post-click engagement checks can now be deployed for cents per session.
Holiday-season budgets now move through the highest invalid-traffic environment in Lunio's dataset, at the exact moment automated placements erase the visibility planners once had into where clicks land. A retailer spending $5 million a year on paid ads loses close to $750,000 in revenue to invalid clicks, even before counting brand-safety and measurement costs. The report's most extreme example, an 81.33% invalid rate on an upper-funnel video campaign spanning more than 15,000 clicks, shows how badly awareness budgets can be undermined by bots and scrapers. Verification checks built into budget planning and attribution become essential as more retail spend shifts into AI-managed formats.