Many businesses and organisations are, at least regarding it as best-practice, if not being required by government guidelines to maintain a guest register.
It makes sense. In the event of someone testing positive it will reduce potential outbreaks if the contact tracing teams can get a handle on who else that person was in contact with.
It could be a hassle, but SignIn makles it easy.
All you have to do is scan the QR code at the location, fill in a couple of details and you can get on with the freedom we all missed.
We hope the time doesn't come, but if someone tests positive, the contact tracing team will be easily and discreetly contact everyone who was in the same place at about the same time.
If the time doesn't come, your details will be completely deleted 28 days (56 in Queensland) after your SignIn, but in the meantime your SignIn will be on secure servers, in a high level data center in Sydney. A server that's Australian owned.
Your details will only ever be available to contact tracing teams and never be used for any other purpose.