[pannSun]

There are plenty of limits on what contracts may contain*, so the "it's legal if both parties sign the dotted line" is, for now, fiction. It's also what every entity able to compel people to agree to its contracts is lobbying for.

*For example, in right-to-work states, employers can't agree to hire only union labor. Strange that that is prohibited, but an omerta imposed on workers is not.