On Android, the OS exposes an API allowing the app to control whether it's visible on the screenshot and screen capturing tools (like screen mirroring to your T

On Android, the OS exposes an API allowing the app to control whether it's visible on the screenshot and screen capturing tools (like screen mirroring to your TV). If the app disallowes screenshots (it's called FLAG_SECURE) your screenshot/stream will have a black rectangle instead of the app image. This is usually requested by bank apps and paid content apps like Netflix. I assume there are provisions for the same thing in all the other supported systems. Everyone without such support will get no video on the affected meetings.