> Fun should be unencrypted.

Five years ago I would totally agree. Now, when you do not want to share your fun thoughts with a border guard; a police person; an AI scavenger; a random jerk -- I would say, having a safe-ish space becomes almost a necessity

This article -- esp. the "In literature" section -- is one of those Wikipedia hidden gems which leave you amused but also worried for them being one day thoughtlessly pruned by some Paladin of Significance

The list of related articles looks really weird, and seems to be algorithmically generated

Reminds me of quantum soccer [1] from a short story by Greg Egan

[1] https://gregegan.net/BORDER/Soccer/Soccer.html