I’ve yet to meet a parent who wished their child had more screen time.Though just how far the problem can go was laid bare in the recent case of KGM against Meta and Google in a US court.The 20-year-old plaintiff, KGM, sued the owners of Instagram and YouTube, claiming that her extensive use of those platforms was driven by a deliberate use of addictive design features and damaged her mental health.KGM said she had been using YouTube since she was six and Instagram since she was nine,...