TIL Zoom has attention tracking features.
Apparently they're not difficult to defeat.
https://www.vice.com/en_us/article/7kzq5x/looping-videos-to-fake-paying-attention-in-zoom-meetings
The tape over my camera works for me.
We use Webex at work, even though we use O365.
A lot of our vendors have switched to Zoom.
MS Teams, use it once and it sets itself to load every time you boot up, and they do it in a couple of places so it isn't trivial to disable it again. Attend another teams meeting and it sets itself to load again. Teams, at least how we've been using it, has no provision to dial in from a phone, you have to be on the app. As I've been working from home I often like to use the cell phone for audio, to save my limited bandwidth for screen sharing.