It would be cool if their script could blackout the participating sites only for visitors from Australia. I wouldn't do this to all my visitors, but I might do it for the small fraction of Aussie visitors.
Too right. As an Aussie I've long since learned to stop gloating over the latest inanities out of Canada, the UK, and USA because grim experience has shown that it's just a matter of time before the remainder embrace whatever moronic "innovation" one of them implements. It's like the politicians in each country, being completely deaf to the actual wishes of their electorate, simply try and outdo the others' misguided policies in a perverse "keeping up with the Joneses" kind of dynamic.
This can and will happen everywhere.
$loc=geoip_record_by_name($_SERVER['REMOTE_ADDR']);
if($loc['country_code'] == 'au') {
// echo out js
}