If the government of a wealthy nation state decides to read messages a given group of people have been sending to each other using user-friendly consumer chat s

If the government of a wealthy nation state decides to read messages a given group of people have been sending to each other using user-friendly consumer chat services, it will succeed. It just can't do so casually, with minimal resources, with a low probability of detection like it can when those messages are sent in the clear. A targeted cyberattack authorized by a warrant is the digital equivalent of sending a SWAT team to kick in a door.