This is what you see when writing a pm:
I understand that the contents of my messages can theoretically be read by anyone with access to Win's database (staff or attackers), and that this is not the right platform for private discussions.
Totally normal I supposed.
Looks normal. Anything you write in your diary can be read by anyone who has access to your diary.
I think they're implying hacking and/or government seizure of servers.
Encrypt your messages peer-to-peer on your own and don't rely on a website's Black Box to do it for you. Download a software Enigma Machine.