Nice write up, but a bit inaccurate here and there. There is a difference between Skype and Skype for Business (rebranded crappy Lync). Also, comparing Teams to Slack is a long shot - try using Teams outside across organisations (companies) without having to login and logout every time. Too much traditional business focus there...

As for Zoom: they solved a lot of their privacy and security issues and have the best video conferencing option. The privacy/security fixes were a bit late perhaps, but nobody expected them to grow so big so fast - first time a virus helped a piece of software other than a anti-virus tool grow so fast.

CEO at Schinchoku and software architect at Delphino Consultancy B.V. — writing about software, and about the Shinchoku startup.