Really though, the point of all this isn't to say they can't take our servers - of course they can, via legal and illegal means. The point is more to say that they can't do it _quietly_, which greatly raises the bar, because now you've got a PR shitstorm to deal with.
But really, it's not going to happen, because we have good legal processes in place. There are proper channels from most countries in the world to the appropriate Australian authorities, and from there to us, and once that request comes in we service it and that's that.
If you want reasonably secure and private email, and you're not doing really dodgy shit, we're probably a safer choice that many. But we're not selling a privacy service, just an email service. If privacy is 100% non-negotiable for you, then you'll need to look elsewhere.