

She is a successful author. She’s never been a great author. Great authors know how to write with originality and imagination. JKR merely took a handful of fantasy and British empire tropes, put them in a blender with ideas ‘inspired’ by vastly better writers and with the help of a PR team, created a marketable franchise.
Along the way, she became consumed by an utterly irrational hatred which is now creating a horrific world for the people she targeted with her marketing money.
I think, as well as the issues you mention, another issue might possibly be duplication. Historically, search engines penalise duplicated content, even across different domains and federation kind of bakes that in.