How private is #nostr?

Could the EU, the US or any jurisdiction ever technically find the IP of the person writing a post on #nostr?

As you know, with Twitter, FB and other platforms, governments all over the world are persecuting people for "hate" speech. I think most people in #nostr are here because in way or the other they think that this specifically is a big slippery slope and that #freedomofspeech is much more important than persecuting people for wrong speech.

I think we all want as much freedom of speech as possible and that's why we're here.

And thus back to the main point, the question really becomes then, how technically difficult is it to find the IP of the person that posted some content? Could the FBI truly knock at someones door for using #nostr?

#libertarianism #liberty

Cheers and thanks!