Anyone who puts anything in writing on the internet should expect it can be read in the event of national security. Same for phone calls with keywords.

This has been a well know fact since the MILITARY developed the internet. We use it because they made it exist.

How stupid would somebody have to be to be putting state secrets into common email?

I have another bulletin for you. If you send questionable substances like unknown powder and so forth, they can also open your postal mail!

All of this goes without saying but OTOH, it has to be something extraordinary to even catch their attention. We are not so fascinating to them as you seem to think.