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> By baking it into the OS, Apple ensures that anyone with an iDevice benefits from it.

But only people with iDevices benefit from it. I prefer Signal to iMessage because iMessage is iOS only, and I'm disappointed with Google for not including an iMessage equivalent with secure messaging by default.

> Compare that to having to download an app that may change depending on possible compromises.

If you mean what I think you mean, using iMessage will not save you/them from this any more than using Signal would, the only benefit to iMessage is that it's already installed on iDevices when you buy them and has secure-messaging enabled by default.

Which is still a step above Android currently - which has no default-installed secure messaging app at all.

I'm lookin at you Google!