You only get to say this if you stake the strong libertarian claim that it's impossible to exploit adults. Make sure you're okay with the most extreme exploitation.
e.g. Why should anyone else get between a literally starving person and an employer asking to sign a contract of lifetime servitude?
Imo contracts should be non-binding
Sign a contract, break a contract, let next contractors decide whether you can be trusted
For high responsibility jobs use either reputation or deposit