I've lived to see this kind of thing enacted in a good portion of the Anglosphere and my visceral reaction is to engage in a combination of civil disobedience and a determination to undermine every overstep made. With regards to things like the Aussie requirement for phone check-ins every 15 minutes or they will deploy police to follow up and confirm your location, turn off the phone and make them eat the cost of hav…
The app only applies to people that need to quarantine, not the general population.
The app allows people who are required to isolate to opt to do their isolation at home, rather than stay at a quarantine facility. Nobody is being forced to use the app.
It is a way for authorities to make sure people are quarantining correctly, and to follow up cases of contact if people break their isolation bubble. Police are not arresting people for failing to check in. (My guess is that they would reset your isolation duration, follow up contacts and/or move you into a managed quarantine).