So then success is tied to intention? What if John Doe did a bootstrap startup with the intention to become the next Bezos, but instead ended up making $500k a year? I'd still call that a success.

What if it ended up that Diaspora managed to gain enough users and convert enough of Facebook's user base to gain about 17.5% market share? (Measured in time online, on-site. Probably hard to measure, but this is a hypothetical.) Would they be a success? What percentage would represent the threshold?