If I could message from out iMessage with WhatsApp I would use iMessage. But since there are about 8% iPhone users here and iMessage is strictly compatible with apple devices… I’m left out from friends, colleagues and family. Apple opening up iMessage is too late. Like iTunes lost to Spotify… Apple’s restrictions forced users to look for alternatives. Those alternatives have become on par or better than what Apple has to offer. Lost opportunity for Apple.Thanks to “people wanting to continue using what they’re familiar with”, really. Apple could open iMessage tomorrow and folks using WhatsApp with all their contacts, group chats, etc. in WhatsApp aren’t going to change. And, anyone signing up for a service are going to look at what their friends/family are using. If they’re using WhatsApp, that’s what they’re going to use. Not because they don’t like iMessage, because iMessage is NOT where the people they want to chat with are.