> Tor did a good job with marketing and optics early on, to make its intended use cases highly visible.
I used to work on Freenet. The mechanic you're pointing out doesn't have to be the dominant effect if the system performs as well as the alternatives. If everything else is equal (speed and convenience), users would of course prefer to have more security than less. If the performance and usability is only slightly worse, users may still be willing to choose security over that (e.g. Tor) - people today are becoming more aware of just how much their data can get abused.
Unfortunately for Freenet the technology wasn't capable enough - the security wasn't worth the usability and performance tradeoffs for most users. That doesn't mean strong security inherently attracts unpleasant types.