He bought twitter like all billionaires buy media outlets. To control his image, promote his business interests, and remove detractors.
He then sells it as influence as well. So he will likely use twitter to control small government officials around the world to ensure he gets his mining operations and tax write offs.
He will likely have a string of leaks surrounding governments who have access to rare earths
Because Tesla needs rare earth minerals right? Musk owns less than 5% of Tesla now. The fact that people still see him as the "Tesla guy" is mind boggling to me. He doesn't need Twitter for PR, as the mere existence of the model 3 is confusing enough to the green energy movement and left leaning agendas, that they don't know which way is up.