If you have a camera on a stand or are holding up a phone, other participants will able to see it and object. Of course it's still possible to get around it. It's possible to get around anything. The idea of privacy controls is to make bad-faith jerks have to work significantly harder.
You can certainly get cameras like that, they're not the norm. You can object to any privacy feature by pointing out that it doesn't provide guaranteed security. Personally I am tired of having my privacy eroded by people holding themselves out as security realists who are always coming up with new ways to break things and/or normalizing existing ones.
