Isn't that a NIP-22 with `I` tags on hashtags? If there is no moderation, I don't think there is a need for picture and about me blurbs as they would just try to drive the conversation to one direction or another. With the hashtag, all the meaning must be extracted by the thing that cannot change: the hashtag name. Everything else is fluid. And it doesn't make sense to remove the fluidness without moderation to enforce a certain view.