The fact that most MAC addresses are not visible to the ISP behind NAT anyway is not the point, given the Department is not renowned for doing its homework.<p>The real concern here is the insight provided by this submission into the sort of thinking that is clearly going on at the most powerful ministerial department in the country. These people don't understand the technology, and fundamentally do not care.
We should be cycling MAC addresses regularly anyway since they leak information: <a href="https://www.crc.id.au/tracking-people-via-wifi-even-when-not-connected/" rel="nofollow">https://www.crc.id.au/tracking-people-via-wifi-even-when-not...</a>
Thats why i'm using my own router (x86 miniPC with OPNsense) on NBN instead of ISP provided one. ISP provided routers are under their full control, you don't have super user password. That and VPN enabled all time on all my devices.