Instructors who teach live online classes should thoughtfully consider whether to require students to use their webcams during class. First is the issue of equity. Second, constantly being on webcam can detract from student learning.... We recommend that instructors stay on their webcams throughout the class and plan selective use of students' webcams for activities such as group discussions, role-play activities, debates, panel discussions, student presentations, and any other interactive activity that would be enhanced by seeing the students who are speaking. Even in those cases, if a student cannot be on webcam, participation via microphone or typed chat can suffice.
https://er.educause.edu/blogs/2020/9/dear-professors-dont-let-student-webcams-trick-you
