So he only really became a billionaire because it was necessary in order to save the world? Is that what his fans actually believe?
That he's not highly motivated by money or luxury, at least at this stage in his life, is obvious for anyone to see.
The fact is that no one in history that has great things for humanity did so without having some degree of mixed motivations.
There's no inherent contradiction in wanting to make lots of money, become popular, become powerful, and do good things for other people all at the same time. In fact, it's a very common set of motivations among smart people.
Really? Are you aware of his gigantic compensation plan at Tesla? The crypto price manipulations? And his lifestyle is anything but ascetic.