it is corrupt

How is minimising tax corrupt?

Any who there is a lot of legitimate reasons for offshore shell companies and quite a few dodgy ones as well. Can't group everything in the leak as the same.

there also lots of rules (tax laws) that fuck you over....double tax from two countries on same money...can't buy land or house as Australian in many overseas countries

if you never move outside of Australia
if you never do business out side of Australia
if you never invest out side of Australia

then there no reason to have offshore company or bank accounts....but if you do one of those 3 things, then you really need to get a good accounted, because you're very likely going get fuck by paying way to much tax