What are the user cases for domain names (take .eth as an example).eth in twitter handle, associate your Etherum community identityEasier wallet/transaction search (for crypto investors)Tip content creator online, need exchange to support itIt is a NFT itself can be traded in Opensea (e.g. Nike.eth sell at 19 ETH)Web 3 content publication can associate to .eth domain (e.g. mirror.xyz here)
