Elon Musk's big plan is simply to build a huge personality cult around him and Twitter is perfect for that.
It's not enough for him to be exceptionally rich, he wants to be adulated.
He wants to hear he is the new Steve Jobs, that he is better than Leonardo Da Vinci. That he got this right, we are living in a computer simulation.
Why do everyone keeps assuming he is playing 10 dimensional chess?
Have you seen his dumb tunnel under Las Vegas? Why would a brilliant engineer build that? What's the big plan here?