I'm not entirely sure what you mean by walled gardens here.

The way I use Nostr is that I mostly stick to the people I follow since I know it's much more likely they will have something interesting to say. If I'm bored I will switch to general and see if I can find more people to follow. I won't pick arguments with people in general and I won't put anyone on my blocklist unless they specifically tag me with something I find abusive.

I am a woman. How does this correspond to the ideas of "freedom" and "walled garden" you're talking about? I don't want a feed that is curated by anyone except me, I don't want anyone else to be censored on my behalf. Nobody can make that decision except me.