[_curious_]

"You haven't heard of anyone working a job they hate in general?"

Yes I hear from people like this often.

Why do you think they continue working?

Some do continue doing things they hate, while others don't and they change their situation. Those that hate their job but don't change, I don't know their reasoning? Learned helplessness? Lazyness?

"Or maybe it is because if they quit, they won't have an easily available opportunity waiting for them, that would allow to feed their family, pay bills, etc.?"

What is easy? What is hard? That's too subjective - I'm not passing judgement in that area, just know that it's possible to change - always - no matter what anyone on HN says.