It’s like a restaurant selling granite rocks for dessert. Nobody will buy them or eat them—so the product fails miserably. But if a popular restaurant adds a dollar to the meal price, and gives every customer a rock with their bill—well, then they can say that:

Every customer gets rocks for dessert.

Every customer pays for it.

Their business is more profitable because of the tasty granite rocks.

I just wanted to spotlight this excellent metaphor tbh.