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Re:Slack – Degraded service affecting multiple features by falcolas on Friday June 28, 2019 @09:38AM (#20304144)
Because they don’t trust their IT or operations groups to manage IRC or any other open source communication system; even as they trust those same people to run the software that makes them money.

/shrug

Re:Slack – Degraded service affecting multiple features by lqet on Friday June 28, 2019 @09:41AM (#20304169)
IRC is just a protocol, neither the server nor the client do have to be open source.