MrBeast has a 'God King' problem

Kevin Mazur/Getty Images; Evan Agostini/AP; Alyssa Powell/BI What do Kim Jong Un, Ayatollah Khamenei, and MrBeast have in common? They all have such control over their fiefdoms that they've been called "Supreme Leader." In the case of MrBeast, YouTube's top star with over 500 million subscribers, the moniker came courtesy of a prospective investor. The financier wanted to add "key man insurance" to a MrBeast fundraising term sheet to hedge against fallout if the company lost its leading man.…