I can only speak to one of the mentioned companies as I worked in this vertical, this has been happening for years across every communication platform. Companies like Symantec, ForcePoint and ProofPoint offer these features out of the box. Setting up rules is as easy as creating a list of keywords or phrases. It is all done under the guise of “treat protection,” meaning if you send a message on teams saying “I’m about to kill this presentation” know a analyst is going look through everything you’ve done in the last 3 months. This includes file movement, internet history, sent messages, emails, screen recordings, and lots of other things. IMO these products are legal corporate malware. In my experience they are mostly used to track people who are about to be laid off.
https://taomm.org/
https://citizenlab.ca/
https://objective-see.org/blog.html