Apple this month published a support document that warns customers against closing their Mac notebooks with a cover over the camera as it can lead to display damage.
The camera cover is also likely to interfere with the auto-brightness setting, True Tone setting. The tolerance for clearance between the display and keyboard is very tight, and a camera cover might end up damaging the screen.
If you close your Mac notebook with a camera cover installed, you might damage your display because the clearance between the display and keyboard is designed to very tight tolerances. Covering the built-in camera might also interfere with the ambient light sensor and prevent features like automatic brightness and True Tone from working. As an alternative to a camera cover, use the camera indicator light to determine if your camera is active, and decide which apps can use your camera in System Preferences.
MacBook Pro users complained about cracked screens to Apple. Then they realized that displays broke after putting on camera cover. The issue appears to be especially bad with the new 16-inch MacBook Pro models that have thinner bezels.
A Redditor was in for horror when he found that his 16-inch MacBook Pro had cracked in the middle. The crack originated just below webcam and propagated downwards.
Damage from applying a webcam cover to the camera is considered accidental and can be repaired under AppleCare+, but it’s quite possible it’s an issue that Apple won’t fix for customers that don’t have AppleCare+, and it’s an expensive fix.
Apple details other ways that let you know if someone is accessing the camera in the background. The green camera indicator light glows whenever the camera is being used. If at all you need to cover your camera, then Apple suggests you use a paper that is no thicker than 0.1mm.
Alternatively, MacBook owners can control which apps have access to the built-in camera as users must grant permission for camera use on any operating system after macOS Mojave.