Ok here is a puzzle: is there any electricity provider who accepts BTC?
BTC runs on fiat money.
BTC runs on fiat money.
But it's also unusual.
The common fallacy in Bitcoin circles is that Bitcoin is the only way to keep your money safe from inflation.
In reality, inflation means that your house, your car, your stock investments, and other holdings are also worth more in dollar-denominated amounts. The only thing that becomes less valuable is cash (and fixed return investment vehicles and such).
My amazon stock that I hold is going up in value, and is therefore "deflationary".
But it would be silly to say that I would never have a reason to sell those stocks.
I sell things, whether they are dollars or stock or crypto, because I want to buy something.
It's the same thing.
The only difference maybe, is regarding friction. IE, maybe it is a bit more difficult to immediately sell the Amazon stock at a store.
But transaction friction is different than the deflation argument.