I think a few of the licenses are due to living in a capitalist society where intellectual property and copyright is a thing. Books I got from LBC mention the creative commons license. I think it's to literally let a person know they can do whatever with the book because many people have probably been conditioned to believe they can't do whatever with it due to copyright. Many books flat out state all these things a person cannot do. So, like, a few books published by AK and PM Press that I have have blurbs stating one cannot reproduce, photocopy, trade, resell...etc without AK/PM Press' permission.
I do agree these licenses are basically just tools for the law and thus incompatible with anarchism.