From the Financial Times–:

“The Australian government asked the public on Sunday to download a controversial Covid-19 contact tracing mobile phone app, which it says will enable it to begin lifting strict social distancing restrictions and reopen the economy. The app, which is based on technology developed by the Singapore government, has provoked privacy concerns among civil-liberties groups and some backbench parliamentarians, who have said they won’t download the technology…..

…The COVIDSafe app uses wireless Bluetooth technology to log the details of people using the app who come within 1.5 metres of another user’s mobile phone. If the user later tests positive for Covid-19, health authorities would be able to access the details of other users who have come into contact with the infected person. Authorities say at least 40 per cent of the public needs to download the app for it to become an effective tool.”

In short, never mind that you or your family and friends do not want this app, have no Covid19, and do not fear getting it.

If even one of your neighbors decides to download the CovidSafe App, your privacy is gone.