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Re:Australia sues Facebook over Cambridge Analytica by grecy on Monday March 09, 2020 @03:20PM (#22528739)
The same way the US government bans certain sites from existing in the USA - (attempted, at least) the pirate bay, child sex trafficking sites etc.

If a government of a country defines a website illegal, then that website simply will not be accessible from that country, end of story.

Re:Australia sues Facebook over Cambridge Analytica by qeternity on Monday March 09, 2020 @03:24PM (#22528776)
*being hosted in the USA

The US, despite leading the charge vis-a-vis the MPAA, has speech laws that make website blocking and censorship extremely difficult.