Also, mark zuckerberg had doctors as parents, went to prep school, grew up in a very affluent suburb in NY, and received a 100k loan from his father to start his business. He also had a safety net to be able to drop out of Harvard lmao. Why do people feel the need to stan for billionaires so hard?
And conspiracy time... many of the early board members of Facebook were CIA-connected and darpa had a project very similar to Facebook called lifelog that was shut down roughly the same time Facebook launched. Anyway, my point is that on top of generally growing up wealthy these billionaires often times are hand picked and propped up by people in government agencies and other billionaires so they literally can't fail
Also, just looked up steve ballmer to find out he also grew up in an affluent neighborhood lol. The only one from your list who seems to have grown up middle class or below is Ellison