It is a good publicity stunt for Meta. They know it is unlikely that they it will get that far, but at the same time they appear like the guard of user privacy. That is quite absurd. Meta makes billions with user data. They do not really need to know the content of the messages. The meta data is much more valuable. It allows Meta to create a social graph of its users. They know who sends messages to who, how often and at what time of the day or the night.
For messages to people really close to you you should NEVER use WhatsApp. If a person is really important to you, you can even use a messaging app just for messages to that person. Meta really should not know when and how often you write messages to your wife, your mother, your kids. You should not use iMessage for all those people either, as Apple is also very interested in your social graph for ad targeting.
Really dangerous people will grow to great length to hide their communication including the meta data. All those anti terrorist measures usually only reduce the privacy of normal people. If you use TOR for example, your connection gets really slow. So most people, who do not do anything illegal, will prefer speed over privacy.