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Beeper Mini’s iMessage app for Android is broken, possibly by Apple
(arstechnica.com)
This is a most excellent place for technology news and articles.
That's true but it's neither an app or a common platform.
It's an exclusive one, hence the headline.
You're right, it's not an app, it's a communication platform -- much bigger.
And, with Apple's marketshare in North America, it's more common than almost any app.