Horrendous. It has been said that there's more slavery in the world today than at any other time. This is nothing short of slavery. Folks should find out who posted the advertisement and lock them away for facilitating human trafficking, and the publisher of the newspaper as well.
It's not necessarilly slavery. The fundamental question is whether these women are enterring into this of their own free will. It seems strange, but many are so poor that they see this as a (or maybe the only) way to a better life.
And the "fundamental question" about the holocaust iss whether the Jews enterred the ovens of their own free will.