>What they do know is what TikTok is, and what it means to be excluded from a Whatsapp group, and to spend hours each day wondering how they should reply to a perceived slight on some Discord channel.

>I successfully forbid FB, Instagram, Snapchat..

If exclusion is what you believe is causing them to be unhappy then forcing them to be excluded seems like an almost sadistic (though likely just misguided) response. I definitely hated when my parents did things like that.