The IT department moves in mysterious ways, its wonders to perform.
I think we moved from Slack to Mattermost because our infosec people weren't happy about Slack's handling of our data; there's a line in an email about "discussions with Slack over the past year regarding their data security and AI initiatives". But then Slack sorted that out to infosec's satisfaction, so we moved back, because running your own Mattermost installation is more of a hassle than paying Slack to do the equivalent.
I think we moved from Slack to Mattermost because our infosec people weren't happy about Slack's handling of our data; there's a line in an email about "discussions with Slack over the past year regarding their data security and AI initiatives". But then Slack sorted that out to infosec's satisfaction, so we moved back, because running your own Mattermost installation is more of a hassle than paying Slack to do the equivalent.