Probably misremembering this, might not have been Kinsella. Anyway, you can put whatever absurd shit you want in a contract or ToS, doesn't mean it is legitimate or legal. Even if you sign a waiver of liability, for instance, if a lawyer can show "reckless disregard for safety", then an operator is still liable. Facebook could have a line in their ToS about you becoming their chattel slave, but it would be rejected. Think there's also a misconception baked in here that AnCaps or libertarians don't believe in any laws, which is not correct.