The Library of Babel = Choose your own adventure?

While thinking about evolutionary forms of literature, one of the ideas which came to me was choose your own adventure. This got me thinking about the concept of the Library of Babel - is the Library of Babel more like a choose-your-own adventure where, despite the title, all choices have been pre-conceived and written, or more like a write-your-own adventure, where the reader eventually becomes the author and writes the next segment?