In related news – worldwide productivity is up
It’s not just flippant to say that either. One company I know “officially” uses Teams. There’s an effectively-secret deployment of Mattermost Cloud for the “teams without whom the company cannot exist”.
Anything official that needs to be shared and recorded for the company or requires widespread notification is through Teams, but then individuals are all using their own apps and management thinks Teams satisfaction is above 90% according to some surveys that no one I've talked to has filled out.