He bought those companies, he didn’t found Them. Anybody can buy a car company or a rocket company if they are rich enough. The only thing he invented was PayPal, and that was not original. And it wasn’t even his idea alone.
And we can like Elon or not (I'm definitely in the latter camp lately) but if it was as easy as you say, there would be tons of other companies making such breakthroughs.
Love him or hate him, Elon didn't let his memes be dreams