I took it to mean any question that, if you don't have a good answer, means your startup shouldn't exist. Like if the answer to "why would someone use you inste

I took it to mean any question that, if you don't have a good answer, means your startup shouldn't exist. Like if the answer to "why would someone use you instead of Google" is null, then you are probably not going to successfully compete with Google. Or, you could come up with the best tool that ever existed for converting WEBP images to PCX, and if you don't have an answer for "who on earth has used the PCX format in the past thirty years" then you're probably not gonna sell many copies of that tool.