I think a closer argument is the textbook content that professors create. Writing a textbook is something that is often done on tenured professor's salaried tim

I think a closer argument is the textbook content that professors create. Writing a textbook is something that is often done on tenured professor's salaried time, essentially paid for by their university. And in the case of public universities that's public money just like research grant money. And yet you never hear the argument that all books academics write as part of their job as tenured professors should be free.