If I remember correctly they contacted me and I had a call with a guy from Twitter where he told me Bluesky's goals were to build a protocol for which Twitter could become a client in the future, to which I said Nostr was a perfect match, then he asked me if I would consider becoming the lead Bluesky person they would pick for leading the effort, and I said ok but asked if it would be acceptable if I just used Nostr as it was as "the Bluesky" without considering the other proposals and he didn't know what to say.

Then he put me in a secret group chat with some other people including SSB people, Mastodon people, the GUN guy and people from a bunch of useless IPFS projects. Supposedly the group was gathered to work together in creating this Bluesky protocol, but I read the entire conversation and it was 100% people just shilling their own projects, so I talked a little about Nostr and the first feedback I got was: "how do we ban people? it looks like it would be very hard to ban", so I said that was the idea and the conversation ended. Maybe Jay Graber was in this chat, but I don't remember reading any messages from her.

Some time after that supposedly this group produced a "report" containing all decentralized protocols in existence and a comparison between them, but it didn't include Nostr. I think the group didn't produce anything and this was likely a solo effort from Jay. The group continued its useless, sparse conversation and Bluesky the company was created through some other means of communication.