I've always found this argument against crypto to be a bad one. The headline will say something like "Crypto mining uses XYZ total energy" and we're supposed to infer that this means crypto is polluting a lot. But it doesn't say how much pollution there actually was. For economic reasons, these miners often use cheap excess energy that would have been produced anyway or green tech. Not all of it obviously, but that level of nuance is missing.
Also, we don't make the same moral arguments against other energy uses. Air conditioners use more energy than Bitcoin mining does, but we don't go around saying the government should ban people from using AC.
There are legitimate problems with crypto, but this one never convinced me