Not sure about cool or interesting, but there are boring but important (to some) use cases, like
- Self custody of wealth, without having to deal with gold
- Payments that don't rely on a middleman like PayPal, Wise, etc, who are known for regularly blocking legal transactions, and sometimes stealing the funds
- Commerce with real privacy (Zcash, Aleo, Aztec, etc)
- DNS without the censorship or rent-seeking
I'd say most of us in the blockchain space are focusing on making those use cases cheap, secure, frictionless and so forth, rather than trying to come up with cool/interesting applications.
- Self custody of wealth, without having to deal with gold
- Payments that don't rely on a middleman like PayPal, Wise, etc, who are known for regularly blocking legal transactions, and sometimes stealing the funds
- Commerce with real privacy (Zcash, Aleo, Aztec, etc)
- DNS without the censorship or rent-seeking
I'd say most of us in the blockchain space are focusing on making those use cases cheap, secure, frictionless and so forth, rather than trying to come up with cool/interesting applications.