His dad was an engineer. Don't know where you got "extreme wealth" from.
https://marketrealist.com/p/was-elon-musk-born-rich/"Musk belonged to an upper-middle-class family in South Africa. So, while they were wealthy enough to have a comfortable lifestyle, they couldn't support Musk after he moved to Canada. Musk didn't get his early money from his parents for startups. There are many myths surrounding Musk’s parents' financial wealth. One rumor is that his father owned an emerald mine, which Musk denied. He actually worked his way through college and had $100,000 in student debt."
There isn't a business owner alive who wants to deal with unions. And his ventures wouldn't be successful if he treated his employees like ****.
His "wealth" didn't enable subsidies, but rather he successfully competed to get them!
Musk is the antithesis of turning piles of money into bigger piles. He makes money by successfully developing cutting edge tech and products. This is what I call true investment, because this is about the only activity that improves our living standards. It's a huge difference from getting rich by "investing" in real estate, stocks, or a million other scams and schemes that simply shift money into your account.