The function of money remains constant. it's always to express value over space and time, but the form (medium) changes over time.

It was government money (fiat) in the twentieth century that allowed for the birth of the heavily interventionist managerial state, with totalitarian authoritarian tendencies.

Bitcoin offers the modern individual the chance to opt out of the totalitarian, managerial, Keynesian, and socialist states. It is a simple technological fix to the modern pestilence of governments surviving by exploiting the productive members of society.