I fail to see what business it is to do with (in this case) Oz for any activity carried out in another country. Whilst "away" the individual is not a burden on the "home" country, is not enjoying(?) any of its benefits, using its amenities or causing any expense to that nation. Amazingly, I did once beilieve all that (the foolish boy that I am) and was subsequently made to PAY for that mistake - slowly, over years and months and after many a descriptive letter from me to boot...!