One of the things that surprises me the most about nostr is that most relays honor deletion requests.
Discussion
Mainly due to: Three "musketeers" most popular relay software honor it correctly (strfry, nostream, nostr-rs-relay). Unless someone really want to make archival relay without deletion π
I agree was expecting to see at least a few "archival relays" in the wild that keep everything forever but haven't come across any