Is it any service that includes the ability to federate? If so, are Matrix/XMPP/other non-ActivityPub services part of the Fediverse, or does Fediverse really just mean ActivityPub?

The context is wanting to promote a Matrix chat room on discuss.online: #online.discuss:discuss.online (see post). Does it belong in Lemmy communities like this one, !fedigrow@lemm.ee, etc? Or does it not count as part of the Fediverse?

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    19 days ago

    So, the term Fediverse basically refers to the ActivityPub protocol and the associated server software. Technically, it’s not just ActivityPub, but also the AT protocol and nostr. Another layer to the Fediverse, at least in my mind, is having some federation. Meaning Bluesky isn’t apart of the Fediverse, even though it’s built on the AT Protocol, because of it’s isolation. Since there’s no interaction with Lemmy, Mastodon, PixelFed, or other federated social networks, it’s not part of the Fediverse.