San Francisco’s Bohemian Club, widely considered a peer institution to Bones, is explicit about this commitment. Its motto, “Weaving Spiders Come not Here,” is emblematic of the society’s commitment to isolating members and the club itself from outside interference. To be an insider is to be vetted, trusted, and personally invested.
That explains something:
https://palladiummag.com/2021/12/16/the-lost-virtue-of-skull-and-bones/
Maybe what this really means is "No spies allowed!"
Good catch, fren!