We had zero cases for months, now we are rising and though our numbers are about the same as they were at the height, they are in the community rather than institutions. It took about a week for things to go right back where they were. They have been very diligent with contact tracing but they are getting to the limit now of what they can do, in terms of following up numbers. As a result they've put the affected city back into strict restrictions now.
But what was the point of it if your borders remained open, there were no fines for people not quarantining, etc?
Our big second wave happened WITH closed borders, it was spread through hotel quarantine. Most of the positive cases in Australia are now of those in quarantine (which is treated much more seriously now). In quarantine there is no temptation to dash to the shops to get some food, get some fresh air etc.
We can't leave the country without special permission, so no risk of holidayers bringing it back with them. When a state has an out break internal borders quickly get closed/monitored, so it doesn't spread to other states.
Fines were high from day 1 for those who broke the rules, which for Victoria included a 5 km restriction on travel, curfew, very restricted businesses able to continue, shopping other than food etc by delivery or click and collect. No visitors, etc. A single person/parent bubble was only introduced when numbers had dropped.