[aylmao]

> Even if he refuse to work with fb, pretty sure a lot of other people will be happy to replace.

I think this applies to some level to entry positions. I know plenty of people coming out of school who need the money, especially considering how aggressive the economic system in the US is to young people (student debt, impossible housing, tough job market to beginners, the responsibility of saving for an uncertain future due to the lack of safety nets, etc). It is also the case there's many people who could replace you: entry-level projects will be done, regardless of wether you do them or not.

Nonetheless, there's a point at which you're set. You could take another job without worries, and in fact you're in demand. Moreover, you're effective at what you do, and have started contributing with decision-making or really bringing efficiency into projects. At this point, other people will be happy to replace sure, but they won't be the same. There's more responsibility on you.

And lastly, you reach the point at which some of these top researchers are. They're beyond fine both economically and career wise-- they don't "need this job". They're also crucial. In their projects it's either them or no one. They are very responsible for their work.