The initial post is literally the flip side of the same coin.
We've had romantic Bitcoin maxis in the beginning, saying Crypto will change the world, we now have luddists screaming to stop the crypto as it will destroy the world.
Only a small portion of users are the Crypto maxis. And they truly can't care less about such posts. They might have been wrong about what Crypto means, but you cannot deny the use. BC is a reserve currency of a nation. EU is contemplating digital euro. People invented a way and are exchanging ownership of IP daily with various block chains.
Crypto is here. I highly doubt it its going away. Too much value and utility.
Perhaps it would be best to simply create a HN News policy to ban crypto related stuff as it really boils down to maxi-haters reiterating their views over and over.
But I do understand that is great for Karma farming.
You're not saving anything. There are valid criticisms of the current financial system, but cryptocurrencies are not a good answer to them.