Historically slavery has certainly been term-limited in numerous jurisdictions. And private prisons certainly can, and do, trade away problem inmates. You are

Historically slavery has certainly been term-limited in numerous jurisdictions. And private prisons certainly can, and do, trade away problem inmates. You are dimly correct in that it is not identical to every other form of slavery practiced historically. But it's close enough for me--and I can only speculate as to your motives for splitting this hair.