> What's the point of success if you can't even speak your mind.

Nobody is stopping him from speaking his mind, he can't talk about his company in certain ways without checking from a lawyer from his company because it affects the other shareholders.

None of this seems to be about "speaking your mind".

> Second thought, are you even a successful person

Elon Musk is by almost any definition a successful person. He has tried to do large things and succeeded.

He is also exceptionally wealthy, which is a simple answer to "what's the point of ...".