IMO it’s a generally good mentality — the fact that dropbox is not
that hard for your average programmer to replicate (by plumbing with existing tech) is exactly why you have so much variety in the software space.
Of course, turning a functional program into a function business is no simple feat, but no one should be looking at these things and thinking “it takes a genius with a once-in-a-lifetime idea” — because, well, it clearly doesn’t. And it’s really not the most incredible or innovative idea.
The intelligence was largely in transforming something you could do into something you could easily do — and identify that it has a potential for profit, and identify how to extract that profit, and executing on it long enough to achieve that profit.