Enlighten me please, my friend. How is it voluntarism?
Voluntarism dictates that all forms of human interactions should be voluntary. In blockchain, as a human, you're relying on the algorithm (i.e. codes on a set of rules), which is the authority in this scenario; and how it works is agreed upon by multiple parties.
You know what else is a set of rules that is agreed upon by multiple parties? A government (at least in theory; but if you aren't happy with the practice, then this is about how it works, not the definition).
RE: Will Blockchain Tech Lead to Next Cival War? - The Decentralization of Power & Wealth