It is hard to comment on this because I don’t know anything about nostr. But knowing about economics in this case may help. I a lot of cases, just a minor fee for doing something changes behavior greatly. The example I like to use is the Aldi’s cart fee of a quarter. Just because of that one little fee for abandoning carts in the parking lot, gets them all returned to the proper place. That to me is amazing!!! A miserable little quarter saves a lot of work gathering carts and returning them to the corral.