Nature has nothing to do with "nature," apart from the fact that science is concerned with the behavior of nature. It originated in 1869, long before climate change or energy waste was a known phenomenon. It's a scientific journal, they would likely accept any paper in support of cryptocurrencies that earned enough reviews.
Additionally, if you are implying that anything "natural" should be biased against cryptocurrencies, you are actually showing support for the root comment. It's admitting that cryptocurrencies are harming nature.