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Slack Vs Microsoft Teams — Which App Is Better For Your Privacy & Security? [Mozilla Foundation]
(foundation.mozilla.org)
This is a most excellent place for technology news and articles.
I honestly don’t know why any medium sized company would use a proprietary chat service.
Your company should want private data on a service they control.
Because they care more about reliability, accessibility, and the ecosystem (don't discount the many many slack bots). Privacy is on the bottom of their list of concerns.