I recently stumbled upon the wonderful world of tildeverse. (See https://tilde.institute/ and https://tilde.team/).
Tilde institute is “a public-access UNIX system running OpenBSD.”
You can sign up, ssh in, and play around.
I would find it quite neat to see a NixOS tildeverse node.
Ephemeral explorations of nix are great. But I find long-lived ssh accessible state shared with other nix users has great adoption and learning potential. I wager it would be a more social and fun way to learn nix.
This of course requires more work, energy and time than I have now. But figured I throw this idea out there!