I'm not sure I grasp your argument here. Jobs at places like restaurants are themselves "extremely poorly-paying" and "physically unpleasant" because of economic coercion and the power imbalance between employee and employer; the employees know that if they complain or refuse to come in on short notice, their hours will be given to someone else and they won't be able to pay the bills. Many women actually say they prefer sex work because it doesn't have these coercive power dynamics and they have more control.

You seem to be arguing that women who do sex work are under "economic duress" because the alternatives are so awful, therefore we should make it illegal, forcing them into back those awful alternatives. That seems backwards to me. Surely we should be banning the shitty, coercive minimum wage jobs, not the sex work women are choosing in preference to them?