Check out the timing. The sex abuse scandal broke in the US in the late 90s/early 2000s and the fight went on here for many years before it spread to the rest of the church.
The church in Rome was blowing it off as an American problem for many years.
That Australian commission was established in 2012. The battle had already been going on for well over a decade in the US.
If you want to see how things were going early on you can look at things like Sinéad O'Connor stuff from 1992:
https://en.wikipedia.org/wiki/Sin%C3%A9ad_O'Connor_on_Saturd...
The Australian Commission wasn't the first effort in a known problem ongoing since first landing, it was the peak response in Australia after many decades of battle ... has there been a national effort of a similar scope in the US ?