You're definitely right that working for these cesspools does add nicely to the resume. It helps them get past the HR drones in the hiring process and it appeals to some hiring managers. They're force fed the BS about how "these experiences will help them land a job elsewhere so just endure the abuse for a little longer and soon you'll cash in!" Oh... you bought a house and got married while working there? Well now you're stuck because you can't afford to leave and you belong to them.
"Don't worry because once your abusive partner is out of your life, you'll find someone else who will treat you the way you deserve!"
Meantime, over here in reality, we try to prevent and protect the souls from being sold into indentured servitude.