One note: energy usage isn't a blockchain problem, it's a proof-of-work problem. Cryptocurrencies (not blockchains) need to enforce resource scarcity somehow, and the first one people worked out involved wasting a lot of power.
That aside, it smells like snake oil because almost every time you hear about it it is snake oil. There are absolutely legitimate use cases for a distributed, immutable ledger, but 99% of the time somebody says "blockchain" it's to impress people who don't understand what a blockchain is.
We're a place where coders share, stay up-to-date and grow their careers.
We strive for transparency and don't collect excess data.