One thing you can do today: review which apps have access to your child's location, camera, and microphone.
On iPhone: Settings > Privacy & Security. Check Location Services, Camera, and Microphone separately. Most apps don't need 'Always On' access to any of these.
On Android: Settings > Privacy > Permission Manager. Same principle.
Apps that seem unrelated to communication or navigation rarely need access to these. If they've asked for it and been granted it, that's worth a look.