They are hypothetical. I asked for "some practical use where they're sufficiently better than existing technologies that they are displacing existing businesses," which is pretty clearly not hypothetical.
Cryptocurrency and blockchain proponents always have hypothetical use cases. The original Bitcoin paper [1] gives a hypothetical use case, a "purely peer-to-peer version of electronic cash would allow online payments to be sent directly from one party to another without going through a financial institution." This still remains basically hypothetical; even prominent Bitcoin boosters have given up on that vision. [2]
I'm done taking hypotheticals seriously in this space; I've seen too much hype and approximately nothing in the way of results. Maybe someday you'll be proved right about your use case. Maybe you'll have customers who not only buy it but keep using it and come back to buy more. But until then, you should expect people to be skeptical. Previous blockchain/cryptocurrency promoters have, for me and many others, used up all the reasonable benefit of the doubt and more.
Cryptocurrency and blockchain proponents always have hypothetical use cases. The original Bitcoin paper [1] gives a hypothetical use case, a "purely peer-to-peer version of electronic cash would allow online payments to be sent directly from one party to another without going through a financial institution." This still remains basically hypothetical; even prominent Bitcoin boosters have given up on that vision. [2]
I'm done taking hypotheticals seriously in this space; I've seen too much hype and approximately nothing in the way of results. Maybe someday you'll be proved right about your use case. Maybe you'll have customers who not only buy it but keep using it and come back to buy more. But until then, you should expect people to be skeptical. Previous blockchain/cryptocurrency promoters have, for me and many others, used up all the reasonable benefit of the doubt and more.
[1] https://bitcoin.org/bitcoin.pdf
[2] https://avc.com/2017/08/store-of-value-vs-payment-system/