When I read this headline, my initial reaction was, "so what?"
Ever since ebook subscriptions were introduced I have asserted that they are not a money-making business model...except for the retailers offering the subscriptions, and to a somewhat lesser extent, the publishers themselves. In fact, only self-published content creators with a solid fan base might make enough money to live on with the subscription model.
As of right now that is a big "maybe".
If recent accounts from top-earning authors on Kindle are to be believed, their income under Kindle Unlimited is taking a real beating. Another recent story on Digital Book World examined the ebook subscription models...