Maybe the author of this piece believes "I don't do X for the money, I do X to make the world a better place / for the love of X". Many people in the arts, education, charities, research etc act as if they believe this.
Perhaps it's never occurred to the author that people with the opportunity to change the world (a) might not care about changing the world or (b) might think a photo sharing app is the best possible way to do it.
Also: (b) is far more likely than (a).
Yet another third option: the people with opportunity to change the world do have the desire, but are working on something else at the moment.
It's a sad fact that the world has an extreme shortage of people with both competence and idealism, because our social system has a strange urge to exterminate idealism at all costs[1].
[1] -- http://www.thebaffler.com/past/practical_utopians_guide
These people then proceed to sulk in a corner at the general suckitude of our species while voting for more capitalism.
An expression of outrage and disgust with no follow-up -- someone else should work for the good of the world, I'm just a regular person trying to feed my family.