More than half of all internet traffic is now generated by non-human sources, according to a report by Cloudflare, a cloud cybersecurity company. This dramatic shift is largely attributed to the integration of AI, particularly Google's Gemini, into search engine functions, which has led to a substantial decline in human traffic across various industries.
The report states that between June 2025 and April 2026, human traffic decreased by at least 35 percent across all major sectors. Google's search engine plays a pivotal role in this trend, accounting for approximately 88% of referral traffic. Cloudflare's findings suggest that Google's AI is now scraping content from websites, presenting it in AI Overviews without directing users to the original sources. Publishers have begun referring to this phenomenon as "Google Zero," a scenario where search referrals yield little to no traffic.
Furthermore, the report highlights that as of June 2026, 52% of crawler requests are for AI training, a significant increase from 22% in Spring 2025. Google utilizes a single web crawler for both indexing sites and training its AI models. This presents publishers with a difficult choice: allow their content to be used in Google's AI Overviews without generating page views, or opt out of AI Overviews entirely, which risks de-indexing from Google's search results. This dilemma is particularly acute given Google's dominance in referral traffic.
While news organizations and media companies were the first to experience the impact, the adoption of Google's AI features has extended to other sectors. Businesses in retail, software, IT, and finance have seen human traffic decline by as much as 40% in less than a year.
In the United Kingdom, a different approach is emerging. Following an announcement by the Competition and Markets Authority in early June 2026, Google was compelled to offer publishers a way to opt out of AI Overviews without facing de-indexing. Google has initiated a trial for UK publishers and has stated that these opt-out controls will not affect search result rankings outside of generative AI features.
This development raises critical questions about the sustainability of online content creation. As AI-driven features consume and repurpose content without providing traffic or revenue to the original creators, the long-term viability of websites that rely on such traffic is uncertain. The report implicitly questions how Google intends to fill its AI Overviews if the very sources that provide the information face financial ruin.