Aside from that, this is still a bill so it has to be passed on many readings and proceedings before it finally becomes a law. And if it becomes a law those who are noncompliant, with this is the fine that they'll have to pay.
Australia to ban credit card use in online gambling, non-compliers to face fines up to $150K
The OP made a mistake on the subject for the lose. The article clearly stated Australian not Australia the country. The government is concerned about the welfare of its citizen since a country full of citizen with gambling problem will affect the overall community performance. This act is to control the addiction of Australian since they are losing enough money just to gamble.
Afaik, Australia is already banned of few online casino due to their online gambling law become strict few years ago.