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Facetime Audio is encrypted, just use that.

Or Signal calling

Lack of support, the government is against popularization of encryption, and who would hold the keys?

End to end encryption would not prevent malware from having access to your microphone.

Nothing can save you if you install malware on your device.

But end to end encryption would be good for everyone -- not just world leaders.

Presumably you would not have malware on your phone on iOS, or at least, that's the goal.