Amazon made its grand entrance into the e-book subscription service market Friday, with the unveiling of Kindle Unlimited. This Netflix-style “all-you-can-read” service gives subscribers unlimited access to a digital library of over 600,000 e-books and thousands of audiobooks for $9.99 a month.

While Amazon boasts that Kindle Unlimited will offer mega popular fiction titles like “The Hunger Games” and “Diary of a Wimpy Kid,” along with huge nonfiction titles like “Flash Boys” by Michael Lewis, there are some notable absences to the lineup. For now, none of the Big-Five publishers will be making their books available through the service. Representatives from HarperCollins, Hachette and Simon & Schuster, all confirmed to the New York Times that they would not be participating.

This lack of Big-Five participation stands in stark contrast to some of the other e-book subscription services out there. For instance, Oyster and Scribd – Amazon’s main rivals in the market – both offer deals with the top publishers, albeit with a smaller overall selection. Scribd’s subscription service includes 400,000 books from more than 900 publishers, including Simon & Schuster, HarperCollins and Wiley (for $9 / month). Oyster, meanwhile, for $10 / month offers more than 500,000 titles, including those from six of the top 10 American publishers, according to The New York Times.

“Maybe if Amazon blocks Oyster and Scribd subscribers from using their subscriptions on Kindle hardware, Kindle users will have no choice in their lending service,” writes Gizmodo’s Kate Knibbs. “But until then, the smaller companies have the necessary licensing agreements to offer a superior selection for the same price per month, if not cheaper.”

But do not write off Kindle Unlimited yet. Unlike its competitors, the service offers access to 8,000 audiobooks with a subscription. That alone, could make the $9.99 a month worth it for some users.