Not even close.
You can quit and go get another job any second of any day with zero consequences.
You have zero financial responsibility or obligations to the investors.
You have zero responsibilities and obligations to clients/customers.
You have zero obligations to financial institutions (banks, loans).
You have zero or little reputation on the line in the industry being addressed. In fact, in most cases competitors will gladly hire you because you have valuable industry-specific experience and training.
I could go on. I see a bunch of comments on this thread painting founders as greedy bastards. All I can say is: I hope you can one day wear those shoes and actually understand reality.
That said, yes, there’s a startup culture that works people to death and often offers dubious outcomes. I really don’t like that at all. In technology some things are very hard. If you don’t work hard it is often impossible to achieve anything of note. I don’t have a problem with that. I am no stranger to 18 hour days, 7 days a week. I get it. A company can’t operate like that forever. If it does, there’s something wrong with it.
As a founder my standard mode of operation is simple: If I am awake, I am working. There’s no way I will demand or request such a thing from anyone else. I am the one whose all-in, not those who work for me.
NOTE: Don’t work for less than you are worth. Option are neat, they could be worth zero or a few million. More often than not they are worth zero. Get fair pay for your work. Assume options are worthless.