That is basically disallowing chats for anyone aside the largest tech companies that actually can filter on a large scale. Although I believe it would only be a

That is basically disallowing chats for anyone aside the largest tech companies that actually can filter on a large scale. Although I believe it would only be applicable to them anyway. End-to-end encrypted messages cannot be scanned. They simply are not end-to-end encrypted otherwise. You can do it client side but that is easily mitigated by perpetrators. To be honest, there are much better methods to fight child abuse. And disallowing people using end-to-end encryption and forcing big tech to scan all messages is an extremely high cost. Not that they do that anyway in most cases because legislation is falling behind...