Non-persistent Wi-Fi MAC randomization
How common it is: not established as a parental-control bypass. AOSP documents non-persistent MAC randomization as an Android 11+ developer option on supporting implementations.
Detection
Repeatedly changing randomized client identities for what appears operationally to be the same handset; multiple stale DHCP/client entries; Developer Options may be enabled.
Fix (technical)
Do not make a single MAC address the sole trust primitive. Use authenticated network access, router device profiles that cope with private addresses, and endpoint controls. No opened Google Family Lin…
Fix (relational)
If this is deliberate rather than automatic privacy behavior, ask why a network quota is being avoided. Revisit whether the quota matches the actual purpose of the rule.
Residual risk
Router implementations differ substantially; device identity can remain ambiguous.
Sources
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android-mac-randomization
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android-cdd17-dev-options