On the other hand, there are plenty of people with determination and focus who aren't successful in the Instagram sense of walking away with $100M+ after 2 years of work.
Looking at how society as a whole generally/broadly defines "success", yes, there are a few cases were not making millions or more is still considered [extremely] successful, but more often than not, "success" at the level of people like the founders of Instagram usually means making bank.
I am in no way agreeing or disagreeing with this notion of "success", just stating how I think society in general broadly feels.
http://en.wikipedia.org/wiki/Rovio_Entertainment