To replace the waste of energy that is building giant sky-penises and glass palaces everywhere which pretend to signal economical strength (banks). Until someo

To replace the waste of energy that is building giant sky-penises and glass palaces everywhere which pretend to signal economical strength (banks). Until someone crunches the math on how much energy the construction and maintenance of every bank on the whole planet costs, including digging shiny rocks out of the earth, I am not sold on "PoW is a waste of energy". It merely compresses the concept behind the existing banking system into its very essence to do that efficiently without bells and whistles.