AI 'slop' drives first major resurgence in MFA ad spend

The re-emergence of MFA spend signals that automated blockers are failing to keep pace with the scale of generative AI production. For streaming and video buyers, this creates a 'quality tax' where low-cost reach mask high levels of ad clutter and non-working inventory. As AI enables bad actors to spin up ephemeral sites that vanish before auditing, the market is shifting from reactive blocklists to 'guaranteed' supply paths and human-vetted direct deals. Expect a widening performance gap between advertisers using curated premium inventory and those optimized purely for the lowest programmatic CPMs. The metric to watch is the ratio of log-level data transparency vs. automated PMP buys in Q3 disclosures.

The resurgence of MFA via generative AI follows a period of aggressive, identity-focused crackdowns across the programmatic ecosystem. In early 2024, the industry was shaken by an Adalytics report alleging that Forbes had operated a ‘secret’ and high-ad-density subdomain (www3.forbes.com) for years, misleading premium brands into buying what was essentially MFA inventory. Per Digiday, April 2024, this prompted a wave of audits from major holding companies like WPP and Publicis, who shifted budgets away from open markets.

Concerns regarding AI scalability have since materialed in industry data. According to DoubleVerify reporting from July 2025, bot fraud linked specifically to mobile app video ads surged over 100% year-over-year, often powered by AI-driven crawlers and scrapers. These tools allow MFA operators to mimic legitimate sites more effectively than traditional templates. In response, measurement firms have introduced tiered brand suitability categories to distinguish between 'High-MFA' (extreme ad density) and legitimate publishers using AI for productivity, a distinction that Jounce Media and others argue is critical to prevent over-blocking.

The regulatory and platform-level environment has also tightened access to the programmatic bidstream. Google Cloud and Azure both mandated multi-factor authentication for all API and admin users throughout 2025 (per Microsoft and Google Cloud updates) to prevent account takeovers used for domain spoofing. Simultaneously, the ANA launched an 'always-on' Transparency Benchmark in August 2025, providing real-time access to log-level data for over 70 participating brands. This platform identified an 'optimization gap' totaling $26.8 billion in wasted global media value, emphasizing that while MFA median spend remains low, the absolute volume of non-working impressions is growing alongside the proliferation of synthetic content.