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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.
Confidently incorrect but ok.
The whole point of RCS is that it's a protocol so there demonstrably would be other apps. It's like saying there's only one app for SMS, it isn't true.
RCS seems to be pretty openly licensed out to other OEMs, definitely a lot better than iMessage.
It's still proprietary though, a far cry from something like Matrix.