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Jack Dorsey departs Bluesky board | TechCrunch
(techcrunch.com)
This is a most excellent place for technology news and articles.
Seems like people were politely dancing around the fact that he was both an essentially absentee board member and a problematic one in openly criticising bsky and poisoning its well in terms of reputation. Seems that push finally came to shove and that he really needed to go and was happy to leave.
He closed his bluesky account some time ago so he must have left then. I assume they had some dnd agreement because only after he confirmed it publicly did bluesky came out with their announcement.