Consent isn’t sufficient to transfer responsibility to another.
These are legalistic concepts, not materialistic concepts.
For example, a contract to transfer responsibility for a crime is invalid regardless of consent.
A contract is valid when it is enforced. And any cartel boss will tell you how "illegal" contracts are regularly enforced between criminal organizations.
Past that, the very subject of crime and enforcement is subjective, as illustrated by the various states of the drug trade, human trafficking, and stolen property. More than one pawn shop has subsisted primarily on fenced goods. The legality of their stock does not appear to inhibit the success of their business.
Legal rights can be fictions but also can be based on ethics.
Ethics has no material basis.
Workers consent to employment unlike kings.
This doesn't mean anything.