Free licenses are here to protect the end users, not the authors. Copyright already over-protects the authors.
A good license for open creative communities is a license that aims to protect the users *from* the contributors, not to protect the contributors from the users.
Because, in the end, the one with all the power is the author.
By licensing work under a free-libre license, an author willingly chose to give a broad, permanent protection to the user against the author’s own rights.