Prevent iPhone being reset to factory settings and changing the Apple ID associated to bypass ScreenTime

It's my personal parent control issue. I have an iPhone and MacBook which has screen time. My kid can bypass it * By spamming unlock it seems that there is a way to prolong extra time endlessly! * By doing factory reset kid simply can resign to new appleid to device without problem! The answer is, the Mobile Device Management for iPhone and proprietary company lock for apple laptops provided for companies. How can I have this for family causes?