Comment by waqf

There's a statistics problem here. Firstly, by Bayes's rule, absence of evidence is evidence of absence: if you didn't find any evidence of harm from piracy when you looked for it, that increases your posterior probability that there isn't any harm from piracy.

Secondly, this isn't just a case of insufficient data for a meaningful answer. This is the most pro-piracy conclusion that could ever come from a study framed as "let's see if there are harmful effects from piracy" — and let's face it, that's the only framing of the study that's going to get funding. The only stronger result possible would be a larger study with the same conclusion.