Have they solved the problem yet that proof-of-work essentially makes the whole thing an environmental nightmare and means it doesn't scale to anything useful in terms of transaction rates? Or the problem that "proof-of-stake" is essentially just a "the rich get richer" scheme? Or the problem that transaction latencies are huge compared to traditional payment methods? Or the problem that blockchains do not have a defined point where a seller of some good or service can be sure the transaction is actually part of the longest chain? Or the problem that the blockchain only ever grows which means it is not feasible to work directly on it on most devices? Or the problem of uncontrolled deflation with a fixed money supply (well, shrinking really if you take into account wallets people lost access to)?
The whole concept is just deeply flawed and meanwhile 99% of actual uses that are not just research are basically scammers.