Elon Musk's companies have been swapping IP and cash. It's led to rumors of potential mega mergers. Spencer Platt/Getty Images The companies led by Elon Musk have become increasingly intertwined in the past couple of years. These firms have shared employees and purchased batteries, software, and vehicles from each other. SpaceX is expected to contribute to Tesla's coming Roadster, for example, and xAI's Grok is in Teslas and Optimus demo bots. For years, the sprawling companies in Elon Musk...