Part of it is the upside / skin in the game aspect changing from small startup days to big company with 100s or 1000s of employees.

You hire differently as well when you are hiring 100s of people instead of a cracked team of 5.

There is a world of difference between "work nights & weekends maybe we become millionaire/billionaires together!" and "work nights & weekends so that you get an exceeds expectations and eligible for a 5% increase on the annual review cycle".

As a leader, it is unreasonable to have the same expectations before & after that transition.