It seems to be in response to websites refusing to take down footage of the white supremacist terror attack by an Aussie in New Zealand a few days ago.
A little click baity to say Australia in general, though if I recall from living there a few years back, Telstra essentially control the network. It is unclear which have been blocked as of yet, by other providers.
So far, the self anointed 'as*hole of the internet' (4Chan), it's own as*hole (8Chan), far right social media outlet Voat, far right news outlet Zero Hedge, and Liveleak have been blocked, unclear if others refusing to take down are also coming.
https://amp.9news.com.au/article/128de87c-0fba-4bac-9e14-d3a1cfbbc6d4
Several websites including 4chan have been blocked by major Australian telcos for continuing to host footage of the Christchurch terrorist attack.
Telstra on Tuesday blocked access to 4chan, 8chan and Voat, the blog Zerohedge and video hosting platform Liveleak.
"We understand this may inconvenience some legitimate users of these sites, but these are extreme circumstances and we feel this is the right thing to do," Telstra networks and IT executive Nikos Katinakis said in a statement.