According to Mike Masnick at Techdirt, the essay in question argues that while file sharing may be illegal, it is not immoral.
She argues that there are a variety of reasons why kids still engage in unauthorized file trading, but one of them is that they just don’t think copyright laws are morally justified. Instead, they see the benefit and the opportunities presented in easier sharing and distribution of works, allowing more people to hear and discover new artists, while opening up lots of new potential business models. All good stuff.
This matches many of our intuitions about the state of copyright being disconnected from many of the norms that have come into existence or evolved in response to the advent of the internet.
The best part of this story, though, is this essay won the contest in question.