I don't think this is without basis? Zoom got some bad press. Unsure if Teams is any better.
Zoom apps sending data to Facebook https://news.ycombinator.com/item?id=22693792
Zoom lying about e2ee https://news.ycombinator.com/item?id=25044254
Zoom installer on macOS https://news.ycombinator.com/item?id=22706650
Zoom rolling its own crypto https://news.ycombinator.com/item?id=22768494
I'd reckon Zoom engs know what's e2ee and what's not. I tend to agree with folks who say their sales team purposefully lied to win deals.
I remember the Facebook thing alone getting about as much airtime as MS's three teams zero days despite being insignificant by comparison.
E2E encryption that isn't properly end to end is newsworthy but it isn't a good reason to justify selecting a competing product that doesn't even try.
IT went as far as remotely disabling the use of zoom after months of pleading with people not to use it.
This was ostensibly done for security reasons (citing zoom bombing, of all things, coz it was in the news).
When teams had a raft of really bad zero days, of course, nobody in IT batted an eye.
MS reaaaallly got its hooks in to that place.
It made me wonder how startups are supposed to compete with this type of thing. Zoom was free and better liked and it still got shut down.