Big difference in Australia with compulsory attendance. Brexit and US were voluntary.
The polls in those two fooled a lot of people, massively so in some cases. Bigly.
Australian election-eve polling is usually spot on. A wise politics observer knows that and can differentiate between Aussie election-eve polls and putting the house on Brexit/US nonsense polls months away from the election with a massively skewed sample and a political agenda to push.
Chalk and cheese. Good Aussie chalk over fake American canned cheese.