ARC was not a legal/Criminal investigation. They had no power to arrest or charge onayone or any corporation.
The website says:
On 12 November 2012 the then Prime Minister, Julia Gillard, announced that she would recommend to the Governor-General that a Royal Commission be appointed to inquire into institutional responses to child abuse.https://www.childabuseroyalcommission.gov.au/final-report
The Commission was an inquiry; a study. It studied the problem and made recommendations. Period.
What it accomplished was to show just how big the problem was in Australia and that there was a need for changes. They could only recommend changes; not enforce them.
What it also accomplished was the awakening of many JWs as they followed the case and watched and/or read the transcripts.
The fact that they got a GB member on the stand and JWs who watched or read saw him lie was huge. Yes he could claim "theocratic war strategy" and that the court was further down the food chain from Jehovah but some people saw through the lies to the real truth. In that sense it was a real win for many people.
And it has become a building block for other lawyers to watch as they actually to charge JWs and the org for not reporting child abuse where they are legally required to do so.
And it highlighted that they will put the org before the needs and rights of the children they are supposed to be caring for.