It is when you are absolutely economically dependent on the outside of the home work, from which you are functionally excluded, of a partner for survival, when even searching for an alternative in the same line is grounds for termination without support, and where the one on whom you are dependent has a legal right to use you sexually without consent (criminalization of marital rape in the US began in the mid-1970s after the mass entry of women into the workforce)? I think “domestic servitude” is an overly positive euphemistic description of the condition women were generally trapped in before their out-of-the-home work became normalized.