Re: Typical
"There needs to be consensus on what qualifies as a link and what qualifies as a full post that requires compensation imho."
I'd be surprised if there isn't such a consensus already. This is a link: https://www.theregister.co.uk/. Any snippet that goes beyond that is reproducing someone else's content. It would appear that the Australian law actually considers links (according to my definition) to be an "interaction with" the news site, whereas most normal people would reckon you were smoking something if you said that.
The difference matters because if FB (or anyone else) can provide enough of a snippet that you don't have to leave their site, then you stay put and continue to contribute ad revenue to FB. If, however, you have to at least /visit/ the news site, firstly you trigger ad revenue for them and secondly there is a non-zero chance that you might stay there for a bit and not return to Zuckerland. (Oh noes!)
Given that difference in behaviour, with its real financial consequences, it is absurd to consider a raw link as an interaction and the law should not do so. However, the rest of the idea is sound because it makes it hard for the likes of FB to cherry-pick news sites for free. IANAL but I suspect the Australian law could be fixed by deleting two lines of text: 52C.1.b.
52C Interacting with content
For the purposes of this Part, a user of a service interacts with content made available by the service if: (a) the content is reproduced on the service, or is otherwise placed on the service, and the user interacts with the content; or (b) a link to the content is provided on the service and the user interacts with the link; or (c) an extract of the content is provided on the service and the user interacts with the extract.