Earlier quoted context omitted.
That's the trap door in this. Apple is going to implement RCS exactly as the specification says it should be implemented, no more or no less. Any incompatibilities with Android will be laid at Google's door to resolve. Having beaten Apple with the RCS stick for the last year, Google might find themselves now getting beaten back.
Apple also stated they would work to add encryption to the RCS spec, poking Google in the eye with their proprietary model. Of course this might not ever happen, but it's still fun to see big companies taking jabs at each other.
(Discontinuing their old magazine features, with nary a month to back up my purchased collection, as a one by one download was the latest thing).