I get you, but I see legal distinctions between the two.
Slavery, owning a human being as property for labor, which may include for sex.
Human trafficking, trade of a human being for purposes of labor which may include for sex.
I would say that the Tates witholding passports and pay and all that shit to manipulate women into doing cam work for them, I would call that slavery. If they ever "sold" or "gave" those women to anyone else, I would say that it's human trafficking.
*Not a lawyer, I had a gut sense and googled the "difference between slavery and human trafficking" as a starting sanity check.
I can't call it a failure. Fun was had. Goals diverged. We split quite amicably and remain in occasional contact. 10/10, would break up with them again.