tl;dr Books, most likely generated by an LLM, were being sold on Amazon under Jane Friedman’s name. The same books were added to her Goodreads profile. Amazon initially refused to remove the books. If it’s happening to her, it’s definitely happening to other authors.
Draft2Digital already exists as a way to publish everywhere except Amazon (and actually you can do Amazon through them too but then both take a cut). I’m not sure what the benefit would be for a publishing service to be connected to the fediverse.