Some authors like it, and some don't, but John Scalzi pointed out that this business model is notable for being different from how the writing industry has worked in the past: "[T]he thing to actively dislike about the Kindle Unlimited 'payment from a pot' plan is the fact that it and any other plan like it absolutely and unambiguously make writing and publishing a zero-sum game. In traditional publishing, your success as an author does not limit my success — the potential pool of money is so large as to be effectively unlimited, and one's payment is independent of any other purchase a consumer might make, or what any other reader might read.
In the traditional publishing model, it's in my interest to encourage readers to read other authors, because people who read more buy more books — the proverbial tide lifts all boats. In the Kindle Unlimited model, the more authors you and everyone else reads, the less I can potentially earn. And ultimately, there's a cap on how much I can earn — a cap imposed by Amazon, or whoever else is in charge of the 'pot.'"