Alphabet (Google)Wide moat

Alphabet is an advertising company in a conglomerate's wardrobe. Of the roughly $403 billion it collected in 2025, about three-quarters came from selling ads¹: $224.5 billion from Google Search itself, $40.4 billion from YouTube's ad breaks, and another $29.8 billion from placing ads across other people's sites and apps. The mechanics could not be simpler to describe or harder to replicate: billions of times a day, someone types a want into a box, and advertisers bid in a live auction for the right to answer it. Alphabet collects on every winning bid. YouTube runs the same auction against attention instead of intent, and the Network business clips a commission for running the plumbing on third-party properties.

The rest of the wardrobe is real but smaller. Subscriptions, platforms and devices — YouTube Premium, Google One, the Play store's cut, Pixel phones — brought in $48 billion². Google Cloud, the one non-advertising business of scale, did $58.7 billion and is the fastest-growing thing in the house, up 82% in the latest quarter with a $514 billion backlog³. Other Bets — Waymo, Verily, the moonshot drawer — collected $1.5 billion, which at this address rounds to a rounding error.

Follow the cash and the company explains itself. Search ads carry margins the rest of corporate America reads about in envy, and they fund everything else: the data centers, the free products with billions of users apiece, the AI research, the bets. Gmail, Maps, Android, Chrome — none of these is charity. Each one is a channel that either collects a query, shows an ad, or defends the road that leads to one. Even the cloud business is, in part, the ad machine's infrastructure sold to outsiders at retail.

So the money is made in one place and spent everywhere — which is why the durability question matters more here than at most companies. Whether that one place is defensible — the habit, the data flywheel, the defaults that route the world's questions through Google's auction — is the moat question, taken up wall by wall in The Moat below, after The Revenue Lines has taken the six businesses one at a time. What could end the arrangement lives in the threats; what the market may be mispricing, in the insights; and the ventures that could someday rival the ad machine — Gemini, Waymo, the TPU cloud — have a wing of their own under Future Bets.