Earlier quoted context omitted.
IIRC it was shown that piracy increases sales for books. For example, if you pirated an ebook and liked it, you'd likely buy a physical copy.
Even if that might be the case now, I doubt that holds if piracy becomes truly widespread. I would suspect A pirates book B and tells C about it, C buys book B is a lot more common than A pirates book B and likes it enough to buy it I have no data to support this, and while I have paid for things I could access for free, but I'm sufficiently pessimistic about human nature to think that's the norm.
Bold. Not inherently incorrect, but not optimally heuristic.