It started out decentralized but quickly consolidated. Cryptocurrencies in theory should enable a sustainable decentralized network.

Yeah but in practice today they are far from sustainable, and have done significant environmental damage due to their ridiculous energy consumption.

This argument is absurb. The damage done by crypto mining is nothing compared to the environmental damage that government(aka weapons) backed fiat currencies have brought upon the world.

One of those provide value, protection, and an exportable / importable product. This actually progresses nations and communities, which is not a waste of energy at all.

The other is crypto mining and crypto currency.

> This argument is absurb [sic].

Your entire argument here is indeed absurd, as demonstrated in this thread.