Although it's true that BTC's energy consumption is bonkers, with this definition, nearly every computation is useless. Hacker New's cryptographically verifying

Although it's true that BTC's energy consumption is bonkers, with this definition, nearly every computation is useless. Hacker New's cryptographically verifying your account's password hash so that you can post this opinion was Proof of Useless Work. Why not spend those CPU cycles on curing cancer? Because that's simply not how the world works. Not everything needs some grand purpose.