Our ACMA has near unlimited power and a lavish budget.
There is a lot they can do to enforce this, but it will revolve around paying a US tech giant to build a solution. Probably one already sold to China.
Discussion
They don't have the manpower to arrest everyone who is going to violate this. It's no different than torrenting in the early 2000s, eventually they just gave up.
Nostr is analogous to torrenting.
Mainstream social media is more Napster.
They know how to control Napsters.
But the point is they don't have the clout to impose rules globally the way the US does. It will be trivial to sidestep with VPNs even for the normie social media
Normies pay for VPNs with credit cards. Would be trivial to stop that, here.
Wouldn't even need to come from the government itself, if "social pressure" were applied to senior bank executives
What often happens (I don't know about this case) is that US corporations and activists try this kid of stuff out in small countries and then use it as a case study back home.
That's what's behind the chat control push back in Europe.
In this case I don't see what they have to gain, unless it's going to be used as a first step towards digital ID permissionsed internet access for the whole population?