>> The dichotomy between the government and private institution you (and many libertarians) present doesn't really exist. Your rights are something that you cannot sign and trade away.

Actually the parent poster was right. The US constitution does not directly apply to the citizens - it defines the role and limits of government power. It was my mistake to say such agreements between people and companies should be unconstitutional. Those are details though, and I mostly agree with the rest of your comment.