“Internationally accepted” in context means other corporations and a telecoms body governed by or influenced if you prefer mostly those corporations. It’s a spin that only makes sense if you ignore what messaging looks like on a modern smartphone in most of the world: apps, most of which are not iMessage and used a lot more than iMessage, RCS or SMS. The blue bubble/green bubble campaign by Google is largely a U.S.-centric PR campaign trying to influence specifically American iPhone customers. You need a better selling point.
Hey you finally arrived at the answer: Apple's solution is Apples' solution, not a standard. Google's solution is the industry, internationally accepted standard and no quotes are needed around that statement. The same standards bodies that formalized SMS did the same with RCS. Everyone except Apple is on board.
You can try all you want to spin this as Apple being in the right, but it's Apple vs everybody on this one.
