Regarding the waste of energy... Miners actually go out of their way to use renewable energy, because it cuts directly in their profits;
LOL. Sure. Miners are so crazy about renewable energy, you can easily visually locate a cryptominer by a huge wind turbine protruding through its roof.
Even when going to vacation, they carry their laptop, a pack of GPUs and a transportable wind turbine with them. You can easily spot a plane full of miners from the ground, by wind turbines sticking out of the windows.
Yeah. Cryptominers are so worried about ecology, it's a miracle...