Certainly Musk doesn't just want to be rich. He also craves power and adoration. Zuckerberg is less public than Musk but could easily have retired if he didn't

Certainly Musk doesn't just want to be rich. He also craves power and adoration. Zuckerberg is less public than Musk but could easily have retired if he didn't actually enjoy having the power of being a mega-tech CEO. So power is at least as important to them as money.