Alphabet's biggest risk isn't a competitor — it's the government. U.S. courts have found Google illegally monopolized parts of search and advertising, and the remedies are still being decided. And nearly 70% of revenue is the ad business in the crosshairs.
↓ the brief below
Concentration · advertising share of revenue
70
%
$77.3B of Alphabet's $109.9B came from advertising. That single business is exactly what the antitrust cases target.
Alphabet faces multiple U.S. antitrust cases over its Search and advertising-technology practices. In one, after an unfavorable judgment, the company's appeal was denied; it implemented court-ordered remedies in October 2025 while continuing to appeal to the U.S. Supreme Court.
↳ This isn't a one-time fine. Remedies can reshape how Google runs Search and ads — the businesses that are 70% of the company.
Source · 10-K · Legal Proceedings — US antitrust litigation · FY2025 · Filed Feb 5, 2026
✦ Teach me
When the product that prints money gets disrupted
Search makes money by showing ads next to a list of links. If people increasingly get a single AI answer instead of clicking links, there's less room for those ads — even if Google builds the best AI. The thing being disrupted is its own cash cow.
Wall Street calls this
AI disruption risk
It's the slow-burn risk under the legal one: the format that funds Alphabet could change shape.
From the 10-K · the company's own words
Our business environment is rapidly evolving and intensely competitive. AI technology and services are highly competitive, rapidly evolving, and require significant investment, including technical infrastructure, development, and operational costs.
↳ Translation: Google has to spend billions to defend the very business model AI might erode — while OpenAI, Microsoft, and others attack the same ground.