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Nothing Phone builds a blue bubble iMessage bridge while Google and Apple fight over RCS
(www.androidcentral.com)
This is a most excellent place for technology news and articles.
That's because you're looking at it from an adults perspective, if you go into a HS you'll see it (Source, used to be a substitute in a past life) and there have even been some articles on it that the whole blue/green bubble thing is targeting by Apple towards teens in HS rather than adults.
Many people never mature past high school so I wouldn't be surprised to see this amongst older people.