Meta debuted its latest artificial intelligence model, Muse Wonder, and says it's the most advanced option for powering digital assistants. But it doesn't come for free. To access the model, users of the Muse personal agent app will need to sign up for a monthly subscription of $20 or $100. The release underscores Meta's efforts to create new AI-derived revenue sources outside of its core online ad business.   Meta AI chief Alexandr Wang said in an interview on Monday that the company developed ...