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Honestly I don’t get it. I don’t know anyone who uses iMessage besides my apple store. Everyone I know uses whatsapp.

The second paragraph makes clear that WhatsApp will need to open up equivalently.

In other words, iMessage will need to be able to send messages to WhatsApp, and WhatsApp needs to be able to send messages similarly to iMessage.

Mostly all of American iPhone owners

I live in the US and I have an iPhone :|