Some of these have changed their Code so much in relation to XMPP, I’m not sure how much it matter that they use it. FBM never could do XMPP group chats. Not once in its dozen+ year life.

Google and FB purposefully removed federation, so it doesn’t make sense for either of them to add it. So WhatsApp is out.

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I wasn’t saying WhatsApp or any chat app specifically should implement Matrix natively. I don’t trust big tech. I am saying, Matrix works well enough and isn’t dependent on the whims of big tech.