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Re:Slack Is Going Public at a $16B Valuation by wayoutthere on Wednesday June 19, 2019 @09:42PM (#20229088)
I don’t know a single enterprise client that enables external Slack users. People are far too careless with what they share in IM (like private SSH keys and IP addresses), and Slack history is a juicy target for hackers diving for secrets.

Enterprise users usually just use it for internal messaging.

Re:Slack Is Going Public at a $16B Valuation by adityasaky on Thursday June 20, 2019 @12:57AM (#20230015)
I'm in a chat or two as a "single channel" user only, and I'm external to that company. It's not uncommon and depends on the scale I think.