Because radio does not stop at international borders, it is subject to an international treaty to which Australia is a signatory. As an amateur operator, you have access to equipment that can broadcast (and potentially interfere) with other countries communications.
For more than a century those engaged in amateur radio have needed to demonstrate their knowledge in basic technical matters, and the rules of the airwaves or regulations.
They obtain an internationally recognised certificate, then a license, and their own personal radio callsign to operate.
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