I don't think he displays any altruistic behaviour if you observe any of his actions.
One has to separate feelings about Elon from objective reality. Seems like a difficult thing to do for most comments here.
No one is exploiting anyone. It is at-will employment. Provides a living wage to thousands of employees to raise their families.
If wealth was stolen, then we'd not have any growth in GDP. 90% people lived in poverty in the 19th century. Capitalism improved lives of millions of people. Every single person is better off today than in 18th century.
You simply cannot become a billionaire without providing value to millions. Exceptions are inheritance and crony capitalists (often in bed with Gov).
Sergey Brin is rightfully a billionaire. He made the world better and so did pretty much any billionaire. I feel like media has been feeding people "Billionaire bad, socialism good" and people have stopped thinking for themselves.