[taolegal]

> I'm reasonably sure that global military industrial complex mostly uses digital money transfers.

It seems like your concept of fiat might be wrong. Fiat isn't synonymous with physical tender. Fiat is just sovereign money in whatever form it takes, digital or otherwise.

Governments enforce fiat as money because it allows them to finance whatever war and other endeavor they want with an endless supply of money that they conjure out of thin air. Whereas taxes are at least paid by people, fiat is a way to steal money from ordinary people by debasing their money.