Tor has massive issues with torrent traffic. Don't do torrent over TOR.
Internet service providers don't directly rat you out. The way it works is: Some (shady) companies watch torrent traffic for the copyright holders, and log the IP addresses. If it's a residential address and from a country they can pursue in, they file a court case. The judge then decides and sends a letter to the internet service provider. The ISP then is obliged to tell the court. It's a lawful request by a court. And then they get you.
Sometimes they can also take some shortcuts for a action for injunction(?). (I'm not sure if that's the correct term.) At least that's what they commonly do in Germany, where I live.
I'm not sure how law works in Australia. But where I live, it's pretty uncommon to pirate content via bittorrent without a VPN. There is a good chance you'll one day get an uncomfortable letter in the mail, if you push it.