Google's AI bet is quietly cannibalising its ad revenue golden goose
Google's search business is still growing. Just... less so. Year-over-year search revenue growth dropped from 17% in Q2 to 12% in Q3, and while that's not a cliff edge, it's enough of a slowdown to wipe roughly $500 billion off Alphabet's market cap and send investors into a mild panic.
The culprit, at least in part, is Google's own AI ambitions. AI Overviews and AI Mode are generating fewer ad dollars per query than traditional search results. Chief business officer Philipp Schindler acknowledged as much on the investor call, blaming a mix of foreign exchange headwinds, Europe scrapping its customs-duty exemption, and what he diplomatically called 'lower monetisation in AI Mode.' Google's response? More ads. The company is expanding AI Overview ad placements and rolling out multiturn ads for AI Mode queries in the US.
Some advertisers are not thrilled with how things are going regardless. Max Anderson, CEO of OnlyFinder, went on social media to accuse Google of compensating for declining search volumes by squeezing advertisers harder, specifically charging more for lower-quality clicks, including traffic from search terms advertisers never agreed to target. That's not a monetisation strategy, that's a shakedown.
Not everyone is doom-scrolling about it, though. Mobile Dev Memo analyst Eric Seufert pushed back on the collapse narrative, pointing out that Google's own earnings release noted search query growth in Q3 was the highest it had been in five years. People haven't stopped searching. The usage is there. The money just isn't flowing from it as efficiently as it used to.
That distinction matters a lot. Emarketer's principal AI analyst Nate Elliott put it plainly: Google owns the activity people use AI for most, which is looking stuff up. Surveys consistently show that most users haven't abandoned search engines; they've just added AI tools on top of their existing habits. If Google can figure out how to monetise that expanded behaviour, the outlook is actually fine.
The problem is the other scenario. If users gradually discover that ChatGPT, Claude, or something else does a better job of helping them find what they need, search habits could shift in ways they haven't shifted in decades. That would be genuinely bad news for a company whose entire business model depends on being the default place people go when they want to know something. Same goes if Google holds onto its audience but simply can't work out how to make AI-era discovery profitable.
Elliott also flagged that Google is being stingy with specifics. The company isn't releasing detailed data on exactly how AI is affecting revenue, which means analysts and investors are left piecing together a picture from fragments. That opacity is doing Google no favours with a market already prone to catastrophising.
One thing worth keeping in perspective: sustaining double-digit growth on what is already the largest, most mature digital advertising business on the planet is genuinely hard. Google has pulled it off consistently for years. A 10-12% growth rate would be the envy of almost any other company. But when your stock price is built on expectations of a Ferrari, anything short of top speed looks like a breakdown.