How to Pick Startup Idea
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However, I am not a fan of "Has business model other than advertising". Although it is something to have in the back of your mind, it is hard to say what the product/idea will evolve into when it actually becomes something that can be profitable.
Your belief in your startup is useless, other than as a way of keeping you motivated until you ship.
This is why MVP and pivot and "throw-jello-at-the-wall-and-see-which-sticks" exist as better, adaptive, strategies.