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Disney hack leads to 1.2TB of Slack communications leaked online
(stackdiary.com)
This is a most excellent place for technology news and articles.
They can still have support contracts and SLA etc from slack.
It's just that the servers slack runs on are on-prem and completely controlled by the business buying into the self hosted licence.
The benefits should be tighter security (say, can only be accessed via VPN), and for many many MAU probably lower costs. Chances are, Disney already has datacenter ops and hardware contracts.
And why choose slack? For quite a while, it was extremely common for developers (maybe even industry standard?). It had loads of features in the small market of internal chat programs. And it's easy to build extensions and integrations for.
I'm not saying that Disney is running on-prem slack, but I wouldn't be surprised if they were