>extracted? As in not through voluntary agreement?

This argument is so facile that I can't believe you are arguing in good faith. The power dynamic between an a low-wage employee (any almost any kind of employee) and an employer is incredibly biased in favor of the employer.

'Extraction' does not imply lack of voluntary agreement, neither does exploitation, in fact[0].

[0] https://www.boeckler.de/pdf/v_2011_10_27_yoshihara_veneziani...