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I know for a fact that it supports end-to-end encryption on alternative operating systems. They don't do anything to disable it. It's easy to check this, and not that hard to actually verify it at a deeper level. They're just washing their hands of supporting other OSes.
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I don't really disagree with alternative mobile operating systems being a security garbage fire more often than not but their generalization is lazy and harmful. The stock OS / firmware / hardware on most devices usually has trash security too but you don't see them mention that.
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They're just being lazy. They aren't going to make people feel insecure by pointing out that most mobile devices have trash security. If they warned people about having an out-of-date patch level, I'd be more sympathetic, because third party OSes generally lie about patch level.
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