The slow part of Australia's Internet I get, that's a very common issue people talk about. What is the nature of the flakiness? If you don't mind elaborating. How frequently is it like that?
The flakiness is a byproduct of constantly degrading last-mile infrastructure that is prohibitively expensive to maintain.
With the exception of FTTP installations that were completed before the NBN[0] became a political football, the majority of consumer internet connections in Australia have a copper last-mile serving ADSL2+. Flakiness with this copper is caused by general network neglect (due to unsustainable maintenance costs) resulting in things like contractors wrapping tangled messes of cables in plastic shopping bags to keep them "dry"[1].
Anecdotally, several ADSL2+ connections I had over multiple years and residences in Australia would noticeably degrade for a week or two after heavy rains. I know others who experienced similar behaviour.
