Google is an ads company with a large amount of infrastructure to back it up.

Sure, the money is mostly in ads, but serving searches, AI, youtube, and all the rest at the scale Google does it requires a technical tour-de-force. Does Google do it better than everyone? Absolutely not. But it does it better than many.

Certainly it isn't the _only_ way to do it--other companies also manage to do it. But not all that many at the same scale. It's an existence proof that you can.