one major use is that it opens up the TLD space which is currently bottlenecked by ICANN
Another use is the ability to actually own your own domain name (instead of rent it).
Another use is the ability to actually own your own domain name (instead of rent it).
“I really hate suffixes, so I want my address to be myproject and not myproject.io”
“I have a business idea which requires me to be a TLD, but I don’t have a ton of money to pay for it”
“I don’t think ICANN dispute resolution process will work in my favor, so I would like to get a domain name not subject to it”
“I think the blockchains are the future, and I really want people to use them”
...but I think they either have a better solution, or not worth trying to deploy yet another domain name system.