I know Libertarians don't think that they're Fascists, because they think of Fascism as a form of Socialism which they oppose,
but,
the historical reality is that in America, Libertarianism and Fascism have been deeply intertwined since the 1930s. The America First movement, for instance.
It was shared opposition to the New Deal that drew them together, and is still what holds them together in the Cryptocurrency scene, since undoing New Deal financial regulation is that scene's primary goal.