So @sequel is not the only social network I've seen that runs through Gemini.
Station is another one:
gemini://station.martinrue.com/
However, Station is centralized.
What I find interesting about @sequel is that it plausibly works more like Mastodon -- you could plausibly run your own server.
As others have noted, @sequel has a bit of an NFT component.
I don't like that, but it is optional.
I'm not telling you to join @sequel, but I want to draw your attention to how the Gemini protocol is being used to create a decentralized social network. Anyway you cut it, that is unique and novel.
And if you don't like @sequel, at least now you have an interesting proof of concept.