I think it's different.  Most people dont know this, but in the first few years of the web, there was actually a list of ALL the servers.  They maintained it for a while.  But it kept doubling every 3 months or so.  In the end they could not keep track.  Nostr is different.  It was on a growth spike  But then that growth stoped and reveresd.  Now the relay is not growing exponentially, or even growing at all.  It may be shrinking  The two systems are quite different.