Some successful entrepreneurs sitting atop billion-dollar businesses say they may look rich on paper, but take a peek into their bank accounts, and they’re actually cash poor. Social media mogul Jimmy Donaldson, known to his 460 million YouTube followers as MrBeast, claims he’s just as broke as everyone else despite running a $5 billion entertainment empire. “I’m borrowing money. That’s how little money I have,” Donaldson told the Wall Street Journal earlier this month. “Technically, everyone watching th ...