Elon Musk's artificial intelligence startup xAI sued Apple and ChatGPT maker OpenAI, for allegedly illegally conspiring to thwart competition for AI, in US federal court on Monday. This comes after Musk threatened to sue Cupertino, California-based Apple, for the same earlier this month. Musk said, "Apple...makes it impossible for any AI company besides OpenAI to reach #1 on App Store."