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Pressure grows on Apple to open up iMessage
(finance.yahoo.com)
This is a most excellent place for technology news and articles.
It was FaceTime, not iMessage. The reason the developers were surprised was that they didn’t own the tech, and Apple lost a patent lawsuit about it and almost had to remove FaceTime entirely. https://www.bbc.com/news/technology-20236114 https://www.fiercewireless.com/wireless/apple-s-facetime-open-standard-never-happened
Oh you're right, I misremembered.
But first you remembered.