They can only compel companies within (incorporated in?) Australia is my understanding, not foreign companies. This is a sad day for a government going out of control; I didn't elect representatives to be this over-reaching or to ignore the wishes of the people like this; again under that old chestnut guise of "Terror!". Doesn't even need a warrant, just a nod from an ex-magistrate, and I'm sure the right ones can always be found.

But I suspect this'll be a testbed for the other Five Eyes; if the public don't make a big noise, I'd expect to see this in the UK, US, NZ and Canada etc pretty soon.