You're wrong. This existed for ages in Windows via Family Safety. Unfortunately, after Microsoft milled Windows Messenger, the feature died, and it wasn't added

You're wrong. This existed for ages in Windows via Family Safety. Unfortunately, after Microsoft milled Windows Messenger, the feature died, and it wasn't added to Skype. I could control my kids contacts in Windows Messenger and in addition to just Facebook Messenger limitations, Family Safety gave me 360-degree control including restrictions for sites, apps, etc.