Unfortunately, too many parents are either too unaware or apathetic to spend 30 minutes enabling parental controls on new phones, tablets, and computers before

Unfortunately, too many parents are either too unaware or apathetic to spend 30 minutes enabling parental controls on new phones, tablets, and computers before handing them off to their kids. Parental controls are very robust now, and easy to remotely manage from your own device. You can create an app whitelist, or require permission for installs, and limit browser usage. Non-emergency usage duration and time-of-day can be fine-tuned. The ability is there but sorely lacking wide adoption, and parents instead stick to more confrontational and less effective techniques such as manual snooping and taking of devices after the damage is already done.