Taggart 
It was my job for a decade to try to keep tweens and teens safe online. Let me tell you what you already know: no law or technology can do it. There are no lengths kids won't go to to talk to friends without prying eyes. The harder you try to lock it down, the dodgier their solutions will be.
Eggs now in different baskets.@mttaggart This will not just be children in the future either. As adults try to avoid identifying themselves to look at adult content or don't want their chat content scanned by client side scanning and so on.
The internet crims are already looking at things like Chat Control 2.0 and rubbing their hands with glee at the prospect of getting punters to download their malware riddled offerings marketed as "encrypted chat programs that your government cannot read".