why?
One very simple benefit is that it's unencumbered by copyright.
I do value the work of human translators; when they're really in harmony with the original work, they can be fantastic. But they can also be disastrous, like Alfred Birnbaum's translations of Murakami, which radically reshapes the protagonist and threw out nearly 20% of the original work.
Every translator is opinionated in some way. I can see the appeal in having something like this as a neutral comparison.
I love the poem and wanted a modern translation with annotations and index, etc., to be freely available to anyone who wanted to read it. I had a sense that Fable would do a really good job. I am pleased with how it came out. The review agents didn't change a single word of the translation, only some of the notes.