Its that there's a geo-blocked/redirected domain which australians will be shown which adjusts prices and collect sales tax.

As an Australian, being geoblocked and having prices dynamically changed/adjusted based upon my IP address is extremely old-hat since half the internet already does it...GST or not...

Edit: although, as an australian, there ARE a whole host of services/content we're not supposed to be able to see because we're australian due to blocking in our country. Its why so many of us use VPN's and dropship services and the like...

My personal favorite is when there is geo-restricted licensing on some content, and the content isn't available in my region so I effectively can't buy something even though I want to. That I frequently have to find an obscure media seller in a foreign country, without enforced geo-restrictions to pay is asinine.

I've been told that, for something as simple as an attached room for an RV/caravan awning. Fiamma product, can't find it in the U. S. "Shipping costs be damned, send me one of those!" And they flat out said they wouldn't. Prolly customs paperwork or something, that they didn't want to do (or didn't know how).