"Feta" is not the heritage of Greek people. It's a Protected Designation of Origin that covers specific geographical locations in Greece, the regions of Thessaly, Thrace, Epirus, Macedonia, Central Greece, Peloponse and Lesvos. Greeks, living in Greece, outside of these regsions, cannot sell their white sheep's milk cheese as feta. For example Cretan cheesemakers, 100% Greek themselves, can't sell their white sheep's milk as feta and must sell it as "white cheese" instead.

Now, if Greeks, living in Greece, making cheese with the milk of Greek animals can't call their cheese "feta" why should Australians whose grandparents came from Greece be able to?