Australia's Plan for Cyber-Safety will not offer an Internet filtering opt-out. Rather, Australians will have to choose between two filtered options: one blocks inappropriate content for children, the other "illegal" content.
Read more about it at "Australians Censor the Internet," "Australia Continues Down the Slippery Slope of Censorship. . . 'For The Children,' of Course," and "No Opt-Out of Filtered Internet."