I thought this was the general idea of starting a business. I think few people start a business thinking they're going to be worth billions. Hell, an acquaintance started a publishing business and is now selling millions of books in niches like "colouring books for adults". He is financially set and could sell for many millions, but few people would ever hear of him or his company. Yet this is fantastically beyond the success of most people.

Are founders actually so delusional that they're really buying into the whole billion+ idea at the outset instead of thinking of how to make a business? That seems rather silly. (Unless the real goal is to find a way to get a couple million personally out of the first few funding rounds. In that case, perhaps it's not a bad gamble.)