@aboxofsox they did not choose something else, but they rather gradually stopped federating with the network, when they had a big enough user base, from what was told me.
Maybe some #xmpp veteran out there could describe it better...
@aboxofsox And yet, none of those services can work with the others.
Who cares that’s xmpp if you can’t use the server of your choice, to connect with the client of your choice to speak to any other user of xmpp ? It could be any protocol that wouldn’t be different.
@aboxofsox With the advent of WebRTC, loss of Federation is not of concern. If your node refuses to fed with mine, I could share a WebRTC link with you, so you can init a chat session w me.
I am not sure that kind of escape mechanism is readily available in AP based Fediverse.