Germany’s competition watchdog, the Bundeskartellamt, has announced the launch of its own antitrust investigation into Apple’s practices.

Apple will now face yet another probe into its oft-criticised “walled garden” and whether it abuses its market position with unfair policies.

"An ecosystem which extends across various markets may be an indication that a company holds such a position,” the Bundeskartellamt said. “It is often very difficult for other...