That's not a very good comparison. Visa is more like the lightning system of bitcoin and ignores the breathtaking energy use of the underlying network. It's a

That's not a very good comparison. Visa is more like the lightning system of bitcoin and ignores the breathtaking energy use of the underlying network. It's a good thing that people can give a decent estimate of bitcoin energy usage. Try doing that with a fiat currency of your choice. Because it's invisible doesn't make it free.