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Bluesky is now open for anyone to join | TechCrunch
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This is a most excellent place for technology news and articles.
Jack Dorsey is no longer part of the project.
Not true, Jack Dorsey is not involved in day-to-day development but is still on the board according to an article a few months ago.
Source
He also has no stake in the company. I'd hardly call that "behind" it.