My guess is nothing. TBH, I’ve no idea what Musk’s goal is with Twitter anymore. He wildly overpaid for it, has done nothing but hurt its value since the purchase, and has oddly taken to bullying random users on his own platform!
At this point, I wouldn’t be surprised to see him spend 28 days trolling the Australian government, people, culture, accent, etc. just for shits and giggles.
I’m kind of expecting him to (continue) run(ning) Twitter into the ground as some weird “because I can” flex on the rest of the world.
If you don't want to operate under the laws of a country, you don't have to do business there.
You do want to run a business there? Then you do have to follow the local laws.
If it costs more (either in money or ideology) for Twitter to comply with this law than Aus brings in revenue, the smart move would be to block all Aus IPs from twitter.
But smart move is not how I would describe any of twitter's actions in the past few months.