Musk called Apple’s App Store rankings an “unequivocal antitrust violation” in a post on his social-media platform X on Monday night and threatened “immediate legal action.” “Apple is behaving in a manner that makes it impossible for any AI company besides OpenAI to reach #1 in the App Store,” he said in the post.

Elon Musk has taken his feud against OpenAI to the App Store, accusing Apple of favoring ChatGPT in the digital shop and vowing legal action.

The billionaire said in posts on X that the consumer tech giant was violating antitrust laws by giving preferential treatment to OpenAI on the App Store.