Apple is making it harder for audiobooks to be sold, according to the streaming service. In a post published just before the company revealed its earnings report, the company called Apple practices anticompetitive and said it was "choking competition".

Apple's rules make the process of buying an audiobook on the service far too complicated and confusing, according to the company. Apple charges up to a 30 percent commission on purchases made in apps listed on the App Store and bars certain developers from using or directing users to an external payment processor

Apple turned down the audiobook purchase process three times because it went against the App Store's policies, according to the company. The price of its audiobooks is hidden to comply with Apple's rules. Instead, you choose the book you want to buy, and then you get an email with a link to check out the internet.

It's hard to compare prices because you only find out about them through the email. This process harms not only consumers, but also authors and publishers who are now under Apple's control. The process of buying an audiobook is not the most elegant.

This isn't the first time that they've called out Apple. The music streaming company filed an antitrust complaint against Apple in Europe because of the company's 30 percent Apple tax.

In the absence of government intervention, Apple has shown time and again that it will not self-regulate and has no real incentive to change. With our Audiobooks launch, Apple has once again shown how brazen it is with its App Store rules, constantly shifting the goal posts to disadvantage their competitors.

If you use Apple's in-app purchase system, you'll have to pay up to 30 percent commission. It would make it harder for them to compete. Apple didn't reply immediately.