Twitter is a private organization and has the right to ban any content they wish.
The user still has the right to say or publish what they want, Twitter may not approve, and therefore filter it out.
Unfortunately they have decided to filter based upon a partners request (Aussie Gov't)for political capital I imagine.
As I mentioned in the title of this post, this is not a ban on free speech, but a very bad business decision. _moves like this offer a wide open space for competition to bust in.
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