Apple's biggest digital money maker. The App Store has been in the spotlight and facing legal and regulatory challenges from its competitors. Our next guest has a new book out today.It's called IW War, Fortnite, Elon Musk, Spotify, WeChat, and laying siege to Apple's empire. And it warns that these court fights are a big distraction and that the tech giant could lose its edge in the AI era. Joining us right now is the author, Tim Higgins.He's the Wall Street Journal business columnist, also a CNBC contribut ...