Musk's, Gate's, Zuckerberg, other-tech-billionaires spawn point was about as good as any other upper middle class American kid's. If you exclude genes were they probably got a bit luckier than average.
I can sort of see how that may be the case with Musk and Zuckerberg, but Gates? Is it normal in US for upper middle class fathers to be partners at multi-national law corporations?
… and specifically to have a company-defining early deal go to someone who shared a board membership with their mother? Microsoft didn’t even have a product when the deal went through (they bought a CP/M knockoff from a smaller company). Gates certainly executed well but most people wouldn’t have had the opportunity to even attempt something like that.