It is a method to verify you are the real BitBees and not a pretender. It works best if you set up your own url to be the verifier. Like bitbees@bitbees.com so if someone were to attempt to be you they wouldn’t be able to replicate bitbees@bitbees.com. They would be bitbees unverified or bitbees@somethingslse.com it’s more valuable if you are someone else coming to Nostr and have a web address that is already associated with you. Then you could use the fact that you own famousbitbees.com to validate your bitbees nostr npub.