A big part of the culture that is enjoyed on nostr is simply because it is small. Think small town vibe vs big city.
I like that I often see familiar faces in the comments. Because you know that you are going to keep bumping into the same users you are incentivised to be nice to them as opposed to a big platform with a billion users where if you insult someone in the comments the chances are you will never see them again.
The human interactions on nostr are valued because there is a real cost/benifit to how we interact.
Just like in a small town if you cut someone off the chances are they know who you are and where you live vs a city with a million cars and you will never have repercussions for your actions.
I am not sure the small town vibe can be retained when you transport everyone to a mega city.
I think the solution for retaining the culture is retaining the small size, if not in overall user size then in the number of users we interact with. Maybe nostr will grow into a mega city but perhaps we should stay mostly in our apartment buildings where we know the faces in our community and have real social capital worth investing in and protecting.