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U.S. officials urge Americans to use encrypted apps amid unprecedented cyberattack
(www.nbcnews.com)
This is a most excellent place for technology news and articles.
Even if we assume they don't have a backdoor (which is probably accurate), they can still exfiltrate any data they want through Google Play services after it's decrypted.
They're an ad company, so they have a vested interest in doing that. So I don't trust them. If they make it FOSS and not rely on Google Play services, I might trust them, but I'd probably use a fork instead.