It’s not that Australia is “in the future”, it’s that local time is oriented toward when the sun is up. I am posting this at 1150 Saturday US Eastern Time, which happens to be 1550 Saturday UTC and 0050 on Sunday Sydney time, but it’s all the same actual time.

Publishers have a choice to make: either release at the same time worldwide in UTC and have to pick which markets get it in the middle of the night, or release in stages worldwide and put up with the fact that one it gets released on one market, enterprising people will figure out a way to play it from anywhere. If it’s an online game, and they are already planning worldwide access, they probably are planning their server rollout regionally, and can turn on the game in each region at a different UTC time of they want to.