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Discord says piracy subpoena would violate users’ First Amendment rights
(www.theverge.com)
This is a most excellent place for technology news and articles.
The feds can also pull such history when they join the server
Sure, and the users of the channel could decide whether to share that history with new users or not. My point is that if you don't have messages on the server, the service can't help here, and it's up to the users of the channel to set their own policies. If the data is stored on the server, the service could be legally obligated to provide that data.