SpaceX’s IPO on Friday allows the public to buy shares of the combined rocket, AI, and social media company for the first time, and is raising enough money to likely make Elon Musk the first trillionaire.  He’ll have more wealth, on paper at least, than the economies of nations like Ireland, Sweden, or his home country of South Africa (CNN cites the International Monetary Fund saying only 20 countries have economies larger than $1.1 trillion), now largely based on the promise of a business based