I am not sure about this, because it undermines privacy in other ways. Now, if I want to protect my privacy by enforcing auth on my outboxes (to restrict reads to people I follow or something), I am banning myself from wisp. Better would be to have some kind of heuristic for relays that might legitimately enforce auth. If someone I follow has a relay that enfoces auth, I don't mind identifying myself. But if I'm browsing topics or whatever that changes.