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90% market share among young people is concerning though. If they never switch that means overall US market share will approach 90% over time.

I'd wager iMessage and Snapchat are big reasons why iPhone is huge with young Americans. Snapchat's Android version is considered to be significantly worse than Apple's. Not sure if that is still the case now, but bad first impressions persist for a long time.

In the rest of the world, Whatsapp and FB Messenger appear to be the dominant messaging apps (outside China of course).

Really? That’s almost too huge to be true. A 10% decrease in one year? Do you have a source on this or an explanation? A cursory Google gives me a current 43% US market share figure.

don't forget market growth.

55%? The last I heard (admittedly a few years ago) Apple was less than 20%. Though, maybe that was worldwide.