Sia used to not care at all about leaks, but all changed when she got big and very wealthy. I guess money change people. But whatever the reason, leaks are of course totally unavoidable in 2016, so it's a part of the game.
Oh. I am a major Sia fan and would die to have that collection.
I remember back in 2005 Sia shared a lot of unreleased songs and demos on her old forum. I'm still looking for the DVD i saved it all on.