The main concern I have with this is the control over the content filter. The ACMA writes the blacklist, but what standards do they use to do so? Does the public have a say in what should be "appropriate" and "inappropriate for children"? Will there be a system in place for the public to lobby against the filtering of certain sites? Will that process be long and tedious and just makes people cbf?
Also, what influences will the politicians have over it? If, say, the Govt deemed "hate sites" to be inappropriate/illegal, and there comes a Muslim politician [no offense intended] who claims that visiting their "Holy Victory" site, which contains hate messages for all other religions, is part of their religious rights, does that provide ground for the ACMA to de-list? Is that justice for other factions/beliefs who may not have as strong lobbying power?