Maybe they think they are showing their patriotism by flying the Boxing Kangaroo, or that they are supporting our sports people, or that they are simply being Aus.
In fact they are flying the flag of the Bond Corporation who owns the trademark on the boxing kangaroo. They are showing their support of a corporation that went arse-up in the early 90s with debts of 1.5 billion dollars, an amount that represented 1/4 of Australia's national debt at the time.
It annoyed me that the boxing kangaroo was being sold at the Olympics. I honestly preferred the unofficial Olympic mascot, Fatso, over those bland corporate figures.