Debt is not a real thing. It's a fiction. Subverting contract law is not like subverting the laws of physics. Simply don't pay your bills! What happens when you subvert contract law is some guys with guns, in either an overt way or a subtle one, force a trade of your imaginary resource (money) for the real resource (labor), through a contract.
It's a bit of clever misdirection to declare yourself "in debt" or "debt free." Money is made up! It's fiction! It is whatever we want it to be!