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Since when became XMPP "the internet standard for chat"? What about IRC[0]? :(

[0]: RFCs 1459, 2810 - 2813, 7194.

Whatsapp, Zoom and Kik Messenger use XMPP under the hood.

Just because it's not well-known doesn't mean it's not widely used

Whatsapp used XMPP many years ago, not today though.

I miss when Facebook Messenger let you connect to it with XMPP back in the day so you could have it together with your other msging services on Adium/Pidgin

Come on, of course there will be some protocols that are more obscure than others, but the overall concept of RFCs is far from "forgotten".

Besides, a lot of these walled chat gardens roll their own XMPP/Jabber thingy behind the scenes.

XMPP has nothing going for it.