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Well, of course. It's zero-sum. For everyone who gets fiat out, there has to be someone who put fiat in.

The way they measured this may not be meaningful, though.

Negative-sum, actually, since the costs of building and operating the mining hardware are massive and have to be paid for by fiat.

Not necessarily. There are situations, for example, where energy that would otherwise be completely wasted is being used to mine BTC.

The amount of fiat available, and it’s value is not constant so it’s not really zero sum.