Wait, so people in the US don't use Whatsapp but iMessage, and using iMessage on Android is possible but costs money? I had not expected either of those, but I

Wait, so people in the US don't use Whatsapp but iMessage, and using iMessage on Android is possible but costs money? I had not expected either of those, but I'd imagine if iMessage costs money on Android, that would massively increase the popularity of either Whatsapp or Signal.