I have some questions that the site doesn't seem to answer: Does this do live audio and video, or do you use something like Zoom alongside it? Can students wr

I have some questions that the site doesn't seem to answer: Does this do live audio and video, or do you use something like Zoom alongside it? Can students write with a finger on a phone? Can students log in to the same session multiple times, e.g. phone to write, computer to view on a bigger screen? It seems to be free at the moment, so what's the business model? Do teachers have classroom management features like muting and kicking out? Is it possible to type as well as write? Is it possible to type maths?