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RCS is finally here for the iPhone, and Google had nothing to do with it
It's not even what Google asked for.
Oh, there is one more important thing: Apple didn't add RCS support to appease Google or as a show of good faith for its customers. Besides the richer user experience, RCS (the way Google does it) supports end-to-end encryption, making sure only you can read a message meant for you. As a company, it would be better if you had grandma buy an iPhone versus supporting something it doesn't think adds value to iOS.
Or read this on Android Central