Parental control apps are a billion-dollar industry built on a structural problem: the device they are installed on was designed, at every level of its engineering, to access the internet. The app is attempting to prevent the device from doing what it was made to do.
This is not a criticism of the apps. Bark, Qustodio, and Google Family Link are well-made products that do what they say. The issue is the category, not the execution.
A motivated teenager with a few minutes of YouTube access can find a VPN that bypasses most content filters. A child who manages to access the device settings — either by guessing the PIN or watching a parent unlock it — can disable restrictions. Factory resetting an Android device removes most parental control configurations. Private browsing modes are accessible from any browser.
None of this means software controls are useless. For the right age range and the right level of concern, they are a reasonable tool. But they are not a substitute for a device that cannot access the internet by design.
