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Digital ads are one of the greatest positive-sum technologies of the 21st century. Google Search has 4 billion users, and they make on average $40 per user per year. This type of business model couldn't exist without ads; Google cannot find 4 billion people who would pay $40 for ad-free search.

Ads enable a powerful technology to become a global utility. They are the great equalizer: even the poorest user can pay for the service with their attention.

Yes, there are lazy and bad ways to do ads. One of the worst things companies can do is to show ads to already-paying customers. This happens most often when consumers have no alternative to a monopoly.