Thanks for bringing this up. Everyone should think about their own comfort level with 3rd party technologies in general. As host, I am not enabling the features to track participants' activities, nor am I consulting any data that may be available to me on individual participants, beyond the name you choose to enter (which is visible to all participants in the call). But I do encourage everyone to consult the links you provided, which I've left below, and decide your own comfort level with using Zoom or any other videoconferencing solution.