It's not just the banking industry that trustless cryptocurrencies can do without, but also the whole infrastructure necessary to maintain the value and trust i

It's not just the banking industry that trustless cryptocurrencies can do without, but also the whole infrastructure necessary to maintain the value and trust in fiat money. This encompasses a very large part of the responsibilities of the political system, army, secret service, ... Those cost centers can't be ignored if the goal is an honest comparison between the energy efficiency of bitcoin vs. fiat.