If you were lucky enough to a) live close to the city b) have telephone poles c) live near a telephone exchange and were chosen by Telstra to get FTTN before the change of government you can get 100Mb+ access. [0] Otherwise you are out of luck.
This is largely a political issue that could be fixed by leadership. Australia has weak leaders of both sides of the political spectrum.
Market forces are supposed to fix this problem according to our learned leaders, but it won't. Australia is big, really big and we needed a federally funded optic fibre solution to the country even if it cost a lot.
Here's my version of NBN... Exchange->fibre->POTS
https://www.flickr.com/photos/bootload/tags/pots
Using technology developed during the early 1900s.[0] Relative has NBN fibre to the node.