Hiring famous well known big names of the industry (even if they're useless and will just coast for crazy money) sends a strong signal to investors and will most likely boost MSFT stock price during this ongoing AI bubble.
And once the AI bubble pops as everyone learns AGI indeed NOT 'around the corner', Microsoft will silently let him go with a golden parachute in the 8 figure ballpark.
At least that's what I learned from watching the Silicon Valley satire.