You are implying that's an obvious judgement but the wide ranges of opinions in the daily cryptocurrency threads on here should clearly show you that it is NOT an obvious judgement. Why are financial instruments not important enough to warrant a measly 0.6% of worldwide consumption?
Such opinions on the cryptocurrency threads tend to come from biased/invested sources who want to either whitewash or ignore it, very few even try to justify it, just dismiss concerns.
It's not measly, it's enough for entire countries of many millions of people. Most countries in fact. That you seek to cast it as "measly" shows that you also are simply seeking to dismiss or whitewash, rather than take the issue seriously.
Because it's just a financial instrument, and it uses more power than the Netherlands, and we have a climate crisis going on. I'm not sure what it is you don't see here.
Any new financial instrument that added a whole country to the energy map like that would be a bad thing.