Here’s an Aussie chiming in. Looking at the IASbet website it explains they are a publicly listed company in Australia, licensed by one of the Australian territories and on their sign up page the default country is Australia. They offer a racebook and sportsbook. Lasseters is the other well known one and they are also an Australian companies, game servers in an Australian territory and also on the sign up page Australia is listed. They offer casino games. So from those answers yes you can.
Now I know this isn’t legislation but gambling sites are a bit more enjoyable to troll through than government sites. An all of the above found found on about 6 pages.