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Nothing's iMessage solution might not be as secure as we thought
(www.androidpolice.com)
This is a most excellent place for technology news and articles.
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Your security is actually worse than a pinky promise in that case because you also have to consider that they could be hacked.
Beeper is pretty good with it, as they make it clear that it's insecure and use an encrypted protocol to get the messages to the server. Still, it's better to host your own (which Beeper lets you do, as it's just Matrix) or not use it.