This is exactly what I&#x27;m talking about.  Apple <i>supports</i> XMPP, in that they read it, but they don&#x27;t publish to it.  Google publishing to XMPP allowed Apple users to read gchat, but nobody else could read iMessage.  This provided an advantage to Apple at cost to Google (why use gchat when iMessage lets you do both?)  The result?  Google proprietarizes gchat so they can compete.