Cosine lets you embed any piece of text and see its nearest neighbors. Each text is embedded only once. If you add a text someone has already added your action and any note you add are recorded along with anyone else who added that text.
Is it a quote book? Is it a weird contest to see if you can get the top neighbor spots? Maybe.
It is an attempt to strip things back and make embeddings the focal point of the system, rather than just a piece.