It is worth noting that they like people thinking that way. A little paranoia is worth having when dealing with these things as it doesn't hurt to be cautious. Yet, I can also tell you they don't stop people making statements about their capabilities, and sometimes they'll spread them too.

They don't for example have the ability to capture ALL phone calls, and ALL emails. Yet people commonly say they do. They don't. It is safe to assume they have the ability to capture MOST of them, but I assure you they cannot capture all of them. There are physics, and other barriers that get in the way of that.

Yet it is to their advantage if people think they can get ALL of them.