This is misguided. The social graph isn't owned by any singular person in it. It is a 3-way agreement between the 2 parties and the intermediary. It is certainly possible that people wouldn't consent to their connection to the individual to be shared outside the network where the agreement was struck. This kind of thinking is what caused the Cambridge Analytics scandal. Obviously startups would like it to be shared since it is so valuable but the privacy implications are too onerous. Even the author covers up members of his social graph as he knows they may not like him to share it.
https://www.dropbox.com/s/rde26cxcwaan311/Screenshot%202018-...