this post was submitted on 11 Jun 2023
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I heard someone say that the messages on Matrix are basically replicated on every server that is federated with another. I don't know if this is true, but that's a crazy amount of network traffic if so. I've also heard anecdotally that the protocol itself is pretty complicated.
Just like… everything that's federated? XMPP, Mastodon, Lemmy ?
As soon as you're in the room (messaging) or following someone or something (social networking), you want to store all their content, so that you have it even if their server is down.
In XMPP old type rooms are not federated, that's where the mantra of "but mah matrix collects more metadata" comes from. On XMPP if the server where the room was created goes down, then it foes down with the room, unlike in Matrix. There is a newer implementation of rooms in XMPP but it's not widely used and, ding ding ding, it has to store content on all servers so it is not centralised