NVK on Nostr: why does it need email?

{ "id": "cc0ddb00191bcec1b82c8cf6c8aa1fe5117a43864d429ddffb48cb81eded3d59", "pubkey": "e88a691e98d9987c964521dff60025f60700378a4879180dcbbb4a5027850411", "created_at": 1721823815, "kind": 1, "tags": [ [ "e", "bc7193a74866ff6ae6014e32db673be548097d199d0f4cbccba808f7d1c35024", "wss://relay.primal.net", "root" ], [ "e", "6c32d87c14dcc1884d200e51cb2be0040a6b56df475afa6e144f15297b202a29", "wss://relay.primal.net", "reply" ], [ "p", "04c915daefee38317fa734444acee390a8269fe5810b2241e5e6dd343dfbecc9" ], [ "p", "e88a691e98d9987c964521dff60025f60700378a4879180dcbbb4a5027850411" ] ], "content": "why does it need email?", "sig": "0ce2d415aaeeae18ca420feac70922aaf0334f38d37a522b0d6473d27702db1a4fc864d122080c791794ca12374f9dc0e2bf114ee43a8b7d4c91896c61a18657" }