It is incredibly wasteful and serves absolutely zero practical purpose other than investments. The justification for this sort of waste and ecological destruction are nearly all religious justifications, faith-based arguments that that the problems that crypto is trying to solve are more pressing problems than they actually are; and that crypto solves those problems in some way that other forms of currency or exchange can't serve. The arguments for pursuing the damage that crypto causes to the world and to human societies is wrapped up in this techno-libertarian nonsense. When crypto evangelists come up with justifications for why crypto is some necessary, important achievement, it's a religious argument that is grounded in faith and not facts or logic.
I don't really care if someone is into crypto from an investment perspective, that they don't really care about the ridiculous harm that crypto does to the environment and our future, if they think that making thousands of dollars personally is worth it for them. If you're willing to just admit that you making a profit on an investment is more important than the vast ecological harm that these pointless, redundant digital possessions cause to the earth, then whatever, I'll give you a pass because your priority is strictly personal gain and you fit into the libertarian religious zealotry. But, if you're trying to argue that there is some other purpose to crypto and that the harm is justified by whatever that purpose is, and if you can't recognize that this is faith-based, religious evangelizing, then I'm going to criticize you for it. So I don't really care about the crypto threads in community that are talking about speculating crypto coins, whatever, it's no that different from oil speculation or rare earth metal speculation at least from an investment perspective. But most oil investors have come to terms with the fact that their financial investments are ecologically bad for the planet, and they just don't care. THis reckoning really hasn't happened within the wider crypto-investing community, and I feel like enough of the community is made up of people who are young, maybe somewhat liberal minded, and are open to the reality of catastrophic climate change, so I think there's a tension there that deserves to be pointed out.
From a humanitarian perspective, most of the bitcoin mining is being done in Xingjiang province in China where the electricity is being generated by slave labor which is why it's cheap to run server farms there to mine bitcoin. While some part of our lives will tie back to this slave labor system throughout China, but there's something particularly nihilistic about slave labor for the sake of a redundant digital possession that serves as only an investment vehicle. It's like investing in triangle trade slave ships in the 1800s. Sure, the textile industry, sugar trade, and far more, were tightly intertwined in the slave trade, but there's something uniquely brazen about investing and profiting in the slave trade for something that has entirely no other purpose other than to pursue individual profit.
I don't think that bitcoin or crypto exploration should be banned or anything. I think as a technological curiosity it is interesting, and whatever mechanism could be used to ban exploration in crypto, blockchain, or whatever other associated technological fields, would be antidemocratic and illiberal.