via Zoom Support Reply: https://twitter.com/zoom_us/status/1241768006327336963
"Hi, attention tracking feature is off by default - once enabled, hosts can tell if participants have the App open and active when the screen-sharing feature is in use. It does not track any aspects of your audio/video or other applications on your window."
Points to this article: https://support.zoom.us/hc/en-us/articles/115000538083-Atten...