Marketers put 24% of search budget into AI visibility. Two vendors cannot agree what the number even is.

Reddit's share of the citations in ChatGPT Search fell from a 3.83% average over July 18 to August 7 down to 0.52% over August 14 to 17, an 86.4% drop, according to Promptwatch, which tracks AI answers across the major platforms. Reddit had been the most cited domain in ChatGPT, nearly double the second place source, Wikipedia. Google's AI Overviews slid 11.3% across a comparable window, and AI Mode 30.5%. Within a day the finding was in Axios, Forbes and Search Engine Land, and every consultant selling AI visibility work was rewriting a slide.

The coverage mostly walked past the strangest part. Not one of the parties involved will confirm that the thing happened.

Promptwatch labeled its own headline finding provisional and wrote that a data-collection issue on its end cannot be ruled out. OpenAI told Yahoo Tech that it does not target or set a fixed level of visibility for individual websites and that Reddit continues to be cited, attributing the movement to routine updates. Search Engine Journal pointed out that the proposed cause, a change on August 8 to how ChatGPT fans queries out to specific sites, predates the sharp collapse by six days. And Reddit's chief communications officer, Adam Collins, told Axios that Reddit's value for communicators is in the real conversations people are having about a brand today, not where it surfaces tomorrow. Reddit added that the drop has no meaningful impact on its business, because AI answers send it almost no traffic in the first place.

Four parties. One number. No agreement on whether it describes anything.

Nobody agrees what the number was before it fell

Ahrefs ran the same question in July and put Reddit at 16.7% mention share, first place, against Wikipedia's 8.9%. Promptwatch put the pre-drop figure at 3.83%. Both are honest. Ahrefs measures a domain against the summed citations of the top sources; Promptwatch measures against every citation returned. Different denominators, same sentence in the deck.

A quarter of the search budget is riding on this

Marketers now route roughly 24% of search and content budgets to AI visibility work, according to Fractl data collected by Digiday. Eighty-two percent allocate something. Forty-three percent spend more than a fifth of the budget on it. That figure is itself a vendor survey with no published sample size, which is either an irony or a warning, and probably both.

What they are buying does not hold still. Fractl's own AI Visibility Index, published August 17, tested 96 industry prompts fifteen times each across GPT-4o, Gemini and Claude, and found that only 11% of the brands it surfaced, around 900 of them, appeared in all three models. Seventy-seven percent appeared in exactly one. A separate study of local queries found Gemini and ChatGPT recommended the same business 4.2% of the time. There is no single AI visibility position to win. There are several, they disagree with each other, and any of them can be revised on a Friday without a changelog.

This is a rented position, not a channel

AI visibility is not a channel a company can own. It is a position inside somebody else's product, granted without a contract, priced at zero, revocable without notice, and measured from the outside by third parties inferring what happened from sampled outputs. When it moves, the platform owes no explanation, and this week demonstrated that it will not volunteer one.

Steve Rubel of Burson put the strategic version to Axios: generative engine optimization does not exist as a reliable tactic, and the answer is engagement across many channels rather than gaming one. That is right, and it is also an admission that the discipline being sold at 24% of budget is a hedge rather than a plan.

We made a version of this argument last week about LinkedIn deputizing a billion members to flag AI slop, where the penalty for getting it wrong is invisible reach suppression. Same shape. The supply, the rules, and the scoreboard all belong to somebody else, and the first time you learn the rules changed is when a vendor's dashboard twitches.

The channel everyone calls unmeasurable

For a decade the knock on in-person has been the one every CEO makes while signing off on a seven-figure GTM budget: in-person is the only channel with no reporting. Events, dinners, the booth conversation and the handshake are expensive and close deals, and none of it survives the trip into a report.

August produced the counter-example. Here is a fully digital, fully instrumented channel where four organizations, two research vendors and a week of trade press could not establish whether a number moved, by how much, or why. The problem was never measurement. It was ownership. You can measure anything you control, and you can only estimate what you rent.

Move AI visibility spend into the brand line, not the pipeline line, and cap it. Any team above 20% of search budget should pull back to single digits until a vendor is willing to put a visibility number in a contract, because a number no vendor will stand behind cannot carry a forecast. The dollars come out best where a company owns both the supply and the record: its own list, its own site, and the room it convened, where the follow up is a fact rather than an inference.