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But why WhatsApp is one of those 3 and Signal is ANOTHER app? Not so long ago WhatsApp was ANOTHER. Now it's not. What changed?

I don't remember WhatsApp ever being ANOTHER. It was the first cross-platform messaging app I ever used.

Wikipedia says it was released in January 2009. Google Talk started in August 2005. For a GTalk user, it was "another".

GroupMe works fine