Wait, what?! Slack got destroyed by Teams? You seem to be living a few parallel universes away from the one I'm in.

Yes, "destroyed" is apt. See the graph under "Slack vs Microsoft Teams: Users" here: https://www.businessofapps.com/data/slack-statistics/

Interesting, but isn't it just because Teams is bundled and integrated with MS Office? I couldn't find any specific stats on revenue or how many businesses actually choose to pay for Teams specifically.

Yes, AFAIK you can't even buy Teams separately, it's only bundled with MS 365. The DAU numbers, however, correspond to people actually online and using Teams for communications, so it doesn't really matter (if we only care about "how many users are using what").

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It's sad but true that many orgs went from Slack to Teams due to Microsoft's monopolistic sales tactics. Sucks because now I use Teams every day.

Teams has 8 times the monthly active users.

Microsoft pushed Teams onto my personal Windows PC in a recent update, as a startup item. And, as far as I could tell, automatically logged me in to my Microsoft account on it.

I'd be very skeptical of their MAU claims.