If spammers create their own NIP05, it will be a good thing for spam filtering. Filtering spam will become easier. NIP05 is only an effective solution when facing a large-scale spam attack. But it is not the only way. But we need to provide users with a tool or button to solve spam now. 

WOT can only see the messages and conversations of the people you follow and the people you follow. This will only form a private space, and you cannot receive messages from new users.