No longer use COVID safe as I've left Australia. Probably was never that much use to me in the 4.5 months I was there anyway, as only had fleeting visits to stores etc, usually when they were quiet, and also may have been useful catching Vline trains, but even then I was between 3 and 10m away from the nearest person
Now using the app it was derived from (called Trace Together) in Singapore, it actually tells you how many exchanges you've had with other users on any given day (just exchanges, not necessarily close contacts). Yesterday, when I really only left the apartment in the morning for a swim and late evening for a walk, quick visit to a store, only had 13 exchanges. On Sunday when I visited a busy hawker stall and walked along the shore, it said I had "339 Bluetooth exchanges". Also being in a semi-authoritarian state, you have to scan your physical ID, or scan a QR code using the app, when you enter or leave places, called "Safe Entry" , to track who is present in a shopping centre, individual store or restaurant etc at any given time for contract tracing purposes.
So now, it's not just google and apple ( I don't run facebook) , but also the Singapore government keep track of my movements.