Gold is drastically more difficult to transact in than bitcoin or any cryptocurrency. Not only is it extremely difficult to create exact change to pay in gold (shaving of milligrams per dollar?) but there is zero infrastructure or education on how to verify that the gold is real. Even modern nation state banks have been fooled by tungsten cored bars of gold.

There are plenty of well established crypto apps that make receipt, verification, and conversion into your preferred cryptocurrencies or fiat currencies instant and effortless.