Earlier quoted context omitted.
More electricity is being burned to do the same amount of work. I know that sounds snarky, but it's how proof-of-work systems like bitcoin work: "miners" all attempt to generate a specific hash which just means lots and lots of computation. The number of transactions per second the bitcoin protocol can handle is essentially capped and completely unrelated to hash rate as the difficulty of producing a correct hash is…
And still no discussion on the value of pissing away our planets energy reserves, just to create imaginary points in a paranoid game. In one view, all the electricity burned to make bitcoins is a crime against the planet.
But then again, I'd rather replace a furnace with a more productive set of hardware anyway.