It's rude otherwise. I don't like attention so much that I only have a few pictures of myself as a child, none as an adult. But you have to put your preferences aside when it comes to business and be professional.
We had someone join our team and in every team meeting they would have their camera turned off while the rest of us had it on. I felt like they weren't part of the team, I could barely remember their face from the interview. Far from the eyes, far from the heart. So when the probation review came I gave them a thumb down, turns out others had the same experience and that person was gone.
You wouldn't hide yourself in the toilet and eavesdrop a meeting if you were in the office. This isn't something that needs "adding to the contract". That's so far from common sense that it hurts me physically reading such comments.