

Blockchains are perfect for anything that needs to be a token in an immutable ledger, such as domain names. We use them as extra, they are not needed but they are nice to have, to show a readable-name.eth or readable-name.sol instead of a long alphanumeric string, as address for plebbit communities and users.
Well, the name can be anything. Seedit is a client for the plebbit protocol, just like Lemmy is a client for ActivityPub protocol.
The same content that you see on Lemmy can be accessed from a different ActivityPub client, like Mastodon.
The same content that you see on Seedit can be accessed from a different plebbit client, like Plebchan. Plebbit will have countless clients, ie. different interfaces for the same data, each with a different name/branding/design.