Not in Australia, they don't. No carrier provides an uncapped plan, and most plans have to be extended with a 'data pack' just to get 1GB/month. If you go over that, you start getting charged per Megabyte.
I recently went on holidays and was merrily tethered away on 4G to Telstra. Hit the cap limit on my plan - 3GB - called Telstra to get a datapack add-on - "I'm sorry, but you are on the highest plan, we can't add on any more data".
Basically I would have had to sign onto a completely new contract to get more data for the 5 days to end of month. Ridiculous.
Do you mean public wifi? There are some areas that have some public wifi (Adelaide has some pretty good coverage in the CBD thanks to Internode, an Adelaide based ISP), but it isn't very common.
If you mean private wifi? Of course we do (in fact the CSIRO - an Australian based research organisation - was pretty pivotal in its invention in the 1990s), but the article is talking about mobile data not wifi.
It's ridiculous.