[duskwuff]

iMessage is end-to-end encrypted. It is unlikely that Apple collects any personal data from it -- at most, they might be collecting some aggregate data, like the frequency with which various features are used.

[crossroadsguy]

> iMessage is end-to-end encrypted

That's what Apple says. I don't think it's ever been independently audited at all; and of course to say source code is not available for the public.