The fact that so many people arrive to nostr asking what they’re permitted to discuss tells us so much about why we need #nostr.
Discussion
I mean, you can't just discuss anything you want, that would be dangerous
And it might displease the powers that be. Tut tut.
They just need to understand that everything is public and permanent. What they post after that is up to them, and they should be prepared for the consequences, if any. Freedom of speech does not equal freedom from consequences of your speech.