nostr nodes also cache data. internet relay chat also caches data. tor relays don't cache data, their name is accurate. nostr relays are not named accurately.
Mere flattery by imitation, a coincidence or is nostr starting to take over…
https://blueskyweb.xyz/blog/5-5-2023-federation-architecture
Discussion
lightning nodes could be better called relays also, they also don't do anything except cache the state of a few channels, and relay payments around by altering that state using the HTLCs.