The political leaders in Singapore redefined "corruption" to suit their purposes. Their claim that Singapore is low in corruption does not tally with the high score the Economist has given to Singapore on "crony capitalism".
Many of the things they do in Singapore will be illegal or not politically acceptable in Australia. Like the wife of the PM heading Temasek. Like the wife of the PM running a law firm doing big government businesses.
When Kevin Rudd became PM of Australia in 2007, his wife has to sell off that portion of her business that has Australian government contracts. Otherwise KR will be plagued by serious conflict of interests and corruption allegations.