Yeah the guy is our generations Henry Ford or Tesla. His whole basis for all these companies, is to slow the rate we are destroying the earth, until mankind can establish itself on Mars and Beyond. Musk fully intends to move to Mars, and help build a sustainable planet there. Tesla, Space X, Boring Co, ect... are all just to fund development of Space X rocket technology. There's a reason Space X hasn't gone public to raise money, and instead has had to prove itself to achieve funding and government and private contracts. He doesn't want to risk losing control of his project from a board and investors, because his ultimate goal isn't to make money with Space X, its to get to Mars. Imagine what NASA could do if it had someone like him leading them.
An excellent biography came out last year on Musk. I highly recommend it.
Elon Musk: Tesla, SpaceX, and the Quest for a Fantastic Future
https://www.amazon.com/Elon-Musk-Sp...UTF8&qid=1545811845&sr=8-3&keywords=elon+musk