The best use case I know of is Handshake. A domain name system that would be resistant to seizures and censorship. Domains are purchased and a fee is paid which gives a sustainable reason for the coin to have value. Though I think the same thing could be accomplished on Ethereum with web3. Of course running your own or shared DNS can have the same value, but I think Blockchain is a legitimate case for decentralizing…
I'm not casting judgement when saying this, but if there isn't a governing body then that's attractive to some people but a huge red flag for others.