The problem with this article is that he does not provide a compelling argument. Or, more accurately, he does not provide an argument at all: he just repeats that unauthorized copying is wrong.

As far as I can tell, he took "piracy is wrong" as an axiom. Which would be fine, except the article is arguing that "piracy" is wrong. Arguing that an axiom--or something you're basically treating as an axiom--is true is trivial and tautological.