"Over the past six months, the utopian phrase has become central to the billionaire’s businesses, belief system and lexicon, according to Mr. Musk’s social media posts and what he has said on podcasts and at company events. "Now his electric carmaker, Tesla, is developing humanoid robots; his rocket company, SpaceX, is promoting orbital data centers; and his artificial intelligence start-up, xAI, is creating A.I. that Mr. Musk has said will solve most, if not all, of humanity’s problems. "'Sustainable abundance via A.I. and robotics,' Mr. Musk said at Tesla’s shareholder meeting in November, where he was backed by a large sign with the phrase: That’s the future we’re headed for ."