After years of tireless effort and billions of dollars invested, nobody has actually come up with a use for the blockchain — besides currency speculation and illegal transactions.
Currency Speculation, Money Laundering, Untraceable payments for Drugs, Guns and Hitmen, and biggest of all Ransomware payments, are all in bitcoin: it is the currency of choice for gangsters and terrorists. Your headline should read “Ten years in, nobody has come up with an ethical use for blockchain.”
They have come up with many uses for it on the dark web and in the criminal world. You are right that there is no use case for cryptocurrencies in the civil society. Easily fixed: have every major country make trading cryptocurrencies for real money illegal, and bar Banks from transacting in bitcoin.