> I don't see how my agreement to their policy should provide them with immunity to what would otherwise be criminal.
But it wouldn't be. It's their computer. If I use your computer, you have every right to examine every file I created while using it; you have every right to install a keylogger; it's your computer (whether it would be decent to do those things is a different subject).
It's not private correspondence if you conduct it in public; it's not private computing if you do it on someone else's computer. If you want privacy, use your own device.
But it wouldn't be. It's their computer. If I use your computer, you have every right to examine every file I created while using it; you have every right to install a keylogger; it's your computer (whether it would be decent to do those things is a different subject).
It's not private correspondence if you conduct it in public; it's not private computing if you do it on someone else's computer. If you want privacy, use your own device.