I assume you're argument is that Google has every right to ads on the page going to the news, but nothing more. The problem at hand shows that Google has gotten so good at aggregating the meta-data about any topic that they can actually use that to the aggregate the data itself, whether it be news, real estate, restaurants etc.
Think about it:
Google already knows search patterns of people searching for travel plans and airfare. They're in a good position to start using that information to find the cheapest fares, hotel and rentals and, without "evil" intentions, start crowding companies like Orbitz, etc.
And this is all fine and well as long as Google is the one obtaining this data on their own dime. The problem you are getting at is that Google is not paying the original aggregator for the original data.
For the realestate article though, the original host of the data(a realestate agent's website) will still get a hit and a possible revenue from their primary income source: selling or renting real estate. Google makes some money of adsense from providing the link to direct data.
Unfortunately for realestate.com.au, they might get left in the dust because their data aggregation algorithm pales in comparison to that of Google and they can't compete with them. Worse, why are they paying a competitor to hopefully promote them over a free service? That just doesn't make any sense.
Now, if Google starts pimping their own service over that of paying customers, as IS this case of that article..well...What I'd do is don't do business with Google, watch as their service fails because of the lack of reliable & meaningful data and hope they don't "tweak" the search results to eliminate you from the search results. Then cash out when Google writes you a 8+ figure check to buy you and your data aggregation company out.
If they actually do a better job than you and force you out of business...well...I guess you're f'ed.
Sorry if this hardly makes sense....All this "meta" stuff is confusing and I'm about to head out for the day.