Llorelie :
Hopefully some time in the next few years the extra business will drive some innovations that will do us some good. Just a hope.
For now, crypto is beginning to cause energy crysis in some countries due to power companies having trouble coping with the increased demand. In Iceland, crypto-mining uses more power than all domestic use combined and the government is wary of building up power generation to accommodate use that provides very little benefit to its economy, little to no benefit to its society and would leave it stranded with that much under-used production capacity when the crypto-mining bubble bursts.
Crypto-mining simply isn't environmentally sustainable. Global warming was already bad enough. Wasting tons of energy on it shouldn't be encouraged.