Bitcoin: Fiat currency on steroids. Might even be a pyramid.
When I think "on steroids" I think of something that is not in a natural state or something that seems better than it is because it is being aided by extraordinary means.
I would think when a government with an unlimited amount of guns and force passes laws to prop up a certain currency or uses their guns to force others to accept a certain currency, that would more fit the description of a fiat currency being "on steroids".
A fiat currency that is only used by those who choose to find value in it and which needs no force of government to spread would seem to me to be a more "natural" currency.
That is just my two cents.