You seem to have missed my point, that being: both fiat and Bitcoin are created "out of thin air." Caveat: fiat has an existent economy behind it, "stuff" backing it--armies, cows, cars, etc., etc. Bitcoin, OTOH, does not. It merely dilutes the currencies of existent economies, much like counterfeit money.
ALL monetary assets are made of thin air, and dilute the market for other stores of value.
That is also true for gold, houses and so on. These things have some intrinsic value, but the monetary part of their value is just as well "made of thin air" and is due to the "next fool" or "same fool" hypothesis.
By "intrinsic value" I understand the price on the hypothetical market where the demand consists solely out of direct or indirect consumption (using the good) and not out of any speculative part. The usage value of gold is not zero, it is used in jewelry and in industry, but it is not very high. Most of the gold price is made out of the monetary, speculative part that doesn't serve usage, and is made out of thin air if you want. The day that everybody thinks that only people having "real use" will accept gold, gold looses its monetary part and becomes "usage gold".
The intrinsic value of a dollar bill is about that of bad-quality toilet paper. It is its only "usage value" where you actually use the bills without betting on anyone accepting them for other things than wiping their ass.
The intrinsic value of a house is a higher fraction of the price: it would be the price you can buy a house in which you can live, but of which you know that you will never be able to sell it (for instance, because it will be destroyed, or the area is going to become an artificial lake or something). The price you're willing to pay for a house, just to be able to live in it, but without the idea of getting anything when you will try to sell it, is the intrinsic value of a house.
Houses have partly a monetary value, that is based upon the expectation to be able to sell it for money. But that fraction is smaller than for gold and for dollar bills.
Monetary value comes from the bet that someone will accept it, because that person makes the bet that someone else will accept it, who makes the bet that still someone else will accept it, etc.... for nothing more than that the next one will accept it. You can call that "thin air". Money is thin air. Always. It can be carried by something that has ALSO usage value, but that usage value has nothing to do with the thing being money in the first place.