Truthfully, there isn't a self made billionaire. They have built upon the legacies and funds their families have at only the right time. Like Gates, he's a Harvard drop out not because he couldn't make it, because he had the right opportunities afforded to him at that time with familial connections to setup Microsoft in one of the cheapest places possible, the garage, so to save money not because they had to but wanted to. Even Warren is the success of his family lineage. Most if not all are just nepo babies.