28 days ?
Isn't that a bit long for "advance notice of algorithm changes" ?
I perfectly agree with Australia's desire to see news outlets get their fair share - which Google has never worried about until now - and I totally support any effort that reigns in this out-of-control behemoth that does whatever it feels like and whines like a child when someone steps up to curb the rampant tracking and broken ad system, but this is the age of Internet and near-instantaneous worldwide communication.
28 days of notice is a perfectly administrative mindset defined by people who do nothing but talk all day long, then agree to meet tomorrow to talk some more. If we admit that an advance notification is useful and necessary, then we also have to admit that five working days is more than enough time to get the notification, read it, understand the impact and explain to the higher-ups.
Especially since Google is just notifying, there's no acceptance to be had. So basically Google could just make a web page listing the changes, send the notification and implement the changes. Why wait ?
Then the page could serve as an ongoing log of what changes Google made, and that would become historical reference at the same time.
Good enough.