I think you're misinterpreting the point of the parent post. The point isn't to prevent free flow of information, it's to prevent plagiarism. Usually, at least in computer science, course materials, lecture notes, and research papers are freely available on webpages. The other side of the coin from making information widely available is that proper attribution and credit becomes very important culturally. There's no good purpose to be served by copying and pasting something that's freely available when you can just link to it instead.