I mean, Musk was born fairly rich, but not like that. Most tech billionaires come from a sort of upper-middle-class to low-upper-class background, probably just because there’s not a lot of super rich families to start with. There are a few lower-class exceptions that prove the rule, although they can be hard to pin down because they all like to claim they grew up rough (and therefore earned their place by being better the peasants), and of course the heirs of other billionaires.

As far as I can tell, they act about the way a random person would given their situation. You get power-drunk dicks like Elon Musk, but also philanthropists like Chuck Feeney (who gave it all away) and Bill Gates, while most just stay quiet and enjoy having unfathomable wealth (Bezos, Zuckerberg).