There is a difference between choosing to work 60 hours at your own startup with the prospect of a very large payout and being salaried at a giant company.
It's almost like how many hours a week a person can work on a thing depends on their ownership of the thing, their domestic situation, and their financial state.
Just to add: ownership and agency, I know a few startup founders who completely wrecked their mental health after accepting dumb money which took away their agency to pursue their vision while still having to work absurd hours.
Ah, but you see, Sergey cares about his company, not their company. Or their lives. Or their needs. Or their wants.
He is Empire and he is what Matters.
I did the same for the projects I created or were fun for me. However, there is a limit and at some point you just hurt your body, some of it can be irreparable. You may not notice it when being younger but you will need to pay for that later.