The coverage I could find suggested that they were available in three total countries: the USA, Australia, and New Zealand.
So there was no point at which they locked out "international audiences". They had a branch in Australia, and they closed it.
In 2007 the copyright lawyers caught up with them and they locked it to US IP addresses: https://mashable.com/archive/pandora-international
Australia-specific operations were 2012-2017.
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The coverage I could find suggested that they were available in three total countries: the USA, Australia, and New Zealand.
So there was no point at which they locked out "international audiences". They had a branch in Australia, and they closed it.