Google’s Q3 stock plunge puts AI spending and Search ad revenue under scrutiny. Here’s what the earnings reveal for PPC advertisers.

Alphabet shares fell about 13% Thursday after Q3 results showed slower Search revenue growth alongside heavy AI spending. The selloff renewed concerns about how Google will fund its AI expansion as search behavior changes.

Some marketers see the results as evidence that Google is protecting revenue at advertisers’ expense. They point to unwanted traffic, broader keyword matching, and rising costs as signs that advertisers are paying for Google’s transition.

The earnings call supports parts of that argument while leaving others unproven. Google’s comments about AI Mode help explain why growing Search usage isn’t translating into stronger revenue growth, and why advertisers may question whether expanding AI ad placements will benefit their businesses.

Alphabet spent $51.36 billion on capital expenditures in Q3 and reported negative free cash flow of $9.07 billion. Those figures put Google’s slower Search revenue growth alongside a substantial spending commitment as it expands its AI business.

For advertisers, the concern is whether Google’s effort to improve AI monetization will increase the cost of reaching customers. Google can generate additional revenue by creating more advertising opportunities, increasing what it earns from existing traffic, or both. Each path has different consequences for campaign performance.

More ad placements could help advertisers reach customers they previously missed. They could also direct spending toward exploratory conversations that produce fewer immediate sales. Higher click costs would require better conversion rates or more valuable customers to preserve the same return.

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