Look. ANYTHING you send over the Internet or World Wide Web, anything sent or said by telephone (land line or cellular, anything send by post, is subject to interception.

If you remember this, you can be paranoid enough to avoid people intercepting your messages.

Remember: The Wehrmacht had Ultra, a very sophisticated encryption system in WW2, and the Allies read their messages. One very significant reason the Battle of the Bulge was such a surprise was that the Generals in charge were old fashioned and sent plans by courier rather than by Ultra.