Sysops respected their users privacy way more than the government does now. But it was always a fear of mine that the SPA would have a sweep in my area and take down a few boards then open all the emails and start tracing the phone lines taking everybody down in the area. You had to be careful of what you said because it could get in the wrong hands.
But we've grown used to this false sense of rights to privacy. The truth is we have no rights and so everything we say/do should be done carefully and underground if we want any chance of privacy.