That shouldn't happen, you need some morality in this amoral system so it can be less exploitative, one way to set some moral guidance is to have a minimum threshold of what people should be paid for a job given that others are already offered that for a similar skillset. Willing to work for less in exchange of other benefits (like moving to a different society) only creates cascading issues for the others who aren't in that desperate position, eroding the labour market.

If people were willing to be slaves, should we allow them?