Which just goes to prove parent's point. As much as it might seem otherwise, IPR restrictions are not the main bottleneck to widespread availability of content (at least book-like content); actually making the content available is far more important!

(Also, keep in mind that content is now entering the public domain every year, and projects like PG are nowhere close to keeping up with that flow of newly-unrestricted stuff. So this dynamic is becoming more extreme over time, not less.)