it's kinda the whole point of nostr, and of PGP sigs in email.. but, if you really like impersonator spam yes it's a huge industry enabled by .. not having sigs.
sorry grandma, that wasn't actually your daughter needing money and stuff 🚑sad.
Discussion
Yes, but how will your grandma remember which npub is the correct one? Also, why would grandma rely on a public forum to verify her daughter?