You don't have a product until there's ~3 customers, with perspective to more. Before that you're essentially a consultant. I'll add that to the next version of the doc, too.
The point is: For anything you build, you can find 1 customer. It's only when there's multiple customers that like the product and want to improve it where you move from "consulting" or "custom development" to "product".
The point is: For anything you build, you can find 1 customer. It's only when there's multiple customers that like the product and want to improve it where you move from "consulting" or "custom development" to "product".