This part in the Delimiter article concerns me:

The Department noted “as a minimum”, the RC Content List — or blacklist — would contain a list of URLs with unencrypted content. But it noted it was aware that there might be some encrypted HTTPS pages — “for example, log in pages” — which could be “seen” by ISPs, and that it was interested in comments on the practicality of including such pages on the blacklist if they had RC content.
If any HTTPS pages are added to a national filter, then it has the potential to kill online commerce in Australia. No more eBaying, no more Amazon-ing, no more paying bills online, etc.