the bundled packaging where they give it away for free to get market share is a well documented antitrust practice.
Lookup diapers.com for instance. Amazon sold diapers below cost to gain marketshare, took all customers from diapers.com, those guys went bankrupt, and Amazon upped the prices to higher levels than before.
I am not suggesting breaking up Microsoft and Teams, I am suggesting that giving away Teams for free should not be allowed, it needs to be fairly priced. But Microsoft has good lawyers of course.