NIP-05 is useful *just* for corporations that already have an already established and known DNS domain, as they can use it to "announce" their official npub. But NIP-05 has no use for individuals without an already existing and well known DNS name. Some nostr clients presenting every profile with NIP-05 as some kind of "verified profile" are just messing around and misunderstanding NIP-05 utility. Impersonators could very easily define any NIP-05 in order to show as verified and try to deceive people.