Visa's underlying currency (fiat) uses *zero* energy (paper notes).
False, quite some energy and other ressources are required for minting/printing and distribution.Childish pedantry. How much energy do you think is used to print a hundred dollar bill? You think the FED is doing J/$ calculations before they fire up their printing presses?
Hint: BTC miners *do*
These will be pretty costy and you have to renew it. Think about it this way: if exact copy of 100 would cost only dollar, wouldnt this be profitable business for many?
An extremely profitable business. Bitcoin miners will continue mining until it costs .99 BTC to mine one, until they waste as much energy as the value of the bitcoin they mine. Hilarious, no?