Also, ironically, crypto is at least as conjured up out of thin air as a properly operated "fiat" currency. A person decided - for whatever reason - that there should be up to 21 million of a new type of token in existence, and his software started printing them and dishing them out to random participants in the network. With a "fiat" currency the actual number in circulation goes up and down according to actual market demand for debt, and in a properly run "fiat" currency the active intervention in that market is taken by named individuals with set targets who publish minutes of the decisions they're going to take.