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Not an expert, but IMO, it’s because it was misused. Cryptocurrency is just one application of blockchain technology, but people equated blockchain to crypto, and crypto was turned into an investment scheme instead of an actual currency. Then came NFTs, which people turned into rugpull scams. And news of the volatility of cryptocurrency and all those NFT scams drove away any chance of regular people adopting anything blockchain-related.
Give me an example of a real world problem that was either unsolved before blockchain solved it, or blockchain solves it better than existing alternatives.
I'll go ahead and save you "decentralized currency/finance between untrustworthy entities" (i.e. cryptocurrency) because it doesn't actually (and can't actually) solve that in the real world. Humans are too error-prone, and an immutable ledger presents too high a risk for business-ending mistakes for any business with any alternative options to adopt it for their primary revenue pathway.
i’ll give it a crack
in australia, we have various credentials provided by the government to attest to a persons fitness to work with children (i’ll just refer to these in bulk from now on as WWCC: working with children checks). there are many of these - one per state for individuals, plus teacher’s accreditations per state, and a few more. they’re ongoing certifications, so can be revoked if anything happens
it’s a legal requirement for businesses who engage in activities involving kids to ensure anyone they employ - including volunteers - is appropriately vetted
needless to say, this gets quite complex for national organisations!
i was the engineering lead for a startup that organisations could add their workforce into the system, with the credentials, and the system checked periodically to check that everyone’s credentials are valid, about to expire, etc and notify people if something goes awry
of course, that doesn’t need blockchain BUT
in cases of child sexual abuse, things tend to only come out after 30+ years on average (according to the royal commission into institutional responses to child sexual abuse). organisations need to be able to prove that they were doing everything they possibly could to protect the kids under their care. 30 years on that’s no small task! our company might not even exist in 30 years!
along with our automated checks, we also published an event to the eth blockchain: a hash of the card details as an index (ie if you know the card details, you can look up all instances of validation), and a hash that proves the check took place
what’s that hash? well, i won’t get too into the weeds but essentially we push a payload to IPFS which contains:
we also published a page on IPFS that allows people to enter card details and load all this information and produce all the technical details to prove what happened (we also had plans for some kind of hardware pack with pinned versions of things because browsers and technology change)
you might be able to do this by relying on the date header that the server sends, but to be really sure, writing the hashes to the blockchain proves that the event given happened at a very specific time and date
blockchain shouldn’t be big and flashy: it’s a very niche use-case, but for those niches there’s really nothing like it