All pharma companies are supervillians, and they all corner supplies and jack prices, but they do it more quietly and usually a little slower. Shkreli just went to the endgame faster, and had a villain media portrait. But he is not any different and he definitely did not induce a Snowden moment. I wish he had.
Questcor on the other hand, I've never heard of. Not a very juicy story, and any juiciness is the result of Shkreli. Will it make a difference? There is a lot of money preventing it from making a difference, but it's about to become a political career killer to allow this to go on I believe. At the very least, it's in the public discourse.
Comparatively, Snowden's revelations hasn't really changed squat either. Maybe I shouldn't be so optimistic.