All good questions, that I don't have any answers to. Plenty of time to figure it out... I'll probably be looking at the larger players to see where this goes, and what clarifying information the government put out next year.
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Discussion about the aussie.zone instance itself
One thought I had was of trying to get an exemption for us. It's a stretch, but if we all sent letters to our MPs and the relevant Minister explaining what we are and why we're not really the intended audience (very small. Mostly adults anyway. Doesn't use an algorithm designed to keep people addicted because it's an open source community project.), just maybe we could get the Minister to declare an exemption for aussie.zone. It's an outside chance, but possible—especially if anyone happens to be friendly with some Government MPs already. (I, unfortunately, am not…unless the next election results in a shock Greens majority 😅)
The only downside I can see of this approach is that it might put us "on the radar" of the government in some sense, though what that would mean in practice is probably nothing, it could be a concern to think about. I would only send such a letter of you wanted that kind of campaign.
Yeah I think any exception for us just brings attention to us which is a double edged sword. More users more members etc more scrutiny unfortunately though