I wonder if other people got confused with this question as well. I understood it wrong initially - I thought the question was asking "how do you know this wil

I wonder if other people got confused with this question as well. I understood it wrong initially - I thought the question was asking "how do you know this will be huge?" (as in "How do you tell whether there's a path out of an idea? How do you tell whether something is the germ of a giant company, or just a niche product? Often you can't" ) Then I realized that's not the question at all, it's just "how do you know people need what you are making?" Literally. I.e., the specific / niche-y thing that you are making first.