I mean, a camera is an easy thing to block, as long as you’re aware of it, understand the implications, and have the desire to block it. Just obstruct the lens. Roll of black electrical tape, put a strip over it, done. Now, most people out there may not actually do so…

Only becomes an issue if other services that you actually want are tied to the camera, or if the TV refuses to operate without a usable picture of the viewer or something.