I think you're still missing the definition of the startup in your reasoning. Starbucks wasn't a startup, and their intention probably wasn't to be the biggest coffee shop chain in the world when they first started. Startups by definition are looking for extreme growth and want to be the biggest "X" of their industry eventually from the getgo. An informed deduction is that you shouldn't make a product that doesn't solve a good large problem if you are a conventional startup.
