Natural phenomena amazing as they are aside...

The "free market" doesn't exist because the economy is governed by rules established by governments and rules between governments in extension.

Cryptocurrencies right now are a speculative trading tool and store of value for others (very volatile at that), but I think that the cryptocurrencies that will really take off and seep into the mainstream are the government digital currencies currently being worked on (China is set to start testing the digital Yuan soon if not already).

My point is that nothing is ever truly free because nothing is ever by itself in a vacuum. You have to interact with outside forces and follow certain rules - natural or otherwise.