Nobody owns an npub. They just use them temporarily
Discussion
Ok, now we getting deep deep
Wait? They will recycle? What about my notes?
On a long enough timeline, if nostr as a protocol is still going and used, then yes, those as well. But by that point, the protocol would change as collisions would be far too common. But this timeline is so far in the future that all time that has occurred until now is just a speck.