https://medium.com/@qroshan/block-chain-solving-imaginary-pr...
"Service Providers like Amazon/IBM have nothing to lose to give ‘Block-chain-as-a-service’ for any one willing to fork their money for such things. They are happy to take your money. Just like a stock broker, the more you use their compute power to do utterly useless things the more profitable they are."
Either way I don't know why your opinion on cryptocurrencies is so harshly negative. Of course it is currently hyped up and of course it doesn't solve all problems as a magic cure-all. BUT there are several real world use cases and dismissing them all just because some people are trying to get rich in the ecosystem isn't warranted.
Now, of course the law isn't always just, it sucks that most countries ban drugs, it sucks that governments don't want anti-government activists to get donations, but the terrible things done with buttcoins vastly outnumber the non-terrible things.
Cryptocurrencies have largely fueled the rise of ransomware, extortion and scams.
People are literally burning energy on hash bruteforcing just so that scammers and malware authors could get paid.