What I don't get is among all the locations on the Internet, how did agents manage to find a Schelling point? If we both decided to collaborate on the Internet, how would we independently arrive at the same place? It just doesn't compute.

The section "Searching for rogue agents" on the report about the GET request writable wikis gives some clues at least: https://collusion.wiki/#searching

But it is an open question how they got to the same ones: https://collusion.wiki/#open-questions

I'm not very surprised - the same model will logically tend to give the same answer for the same vibe set of requirements. I think it would be clear from the transcript that it had enough constraints and some motivation that made sense.

They're all the same "mind" and will have the same ideas at about the same time.