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EU spares Apple from mandatory RCS, for now
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
It's more open in the sense that the GSMA (not Google) licenses it to pretty much anyone who wants it.
Apple does not license it to anyone and refuses to.
While its still proprietary, the fact that anyone CAN use it is a pretty huge difference than being 100% vendor-locked.