There are many stories on the net about how the government or hackers are following you through a webcam on a laptop. Therefore, some experts recommend sticking it for safety. However, Apple strongly recommends that you do not do this with very compelling reasons.
In the support section on the Apple website, an article was found devoted to the use of different stickers and protective covers for cameras on MacBook laptops. It says that if you still use some kind of overlay on the webcam, then in this case you should not close the laptop, as this can lead to breakage.
Since the gap between the display and the keyboard when closed is minimal and calculated by the company with high accuracy, any deviations can damage the screen. In addition, stickers on the camera can affect the operation of the light sensor and interfere with functions such as automatic brightness control and True Tone.
Apple notes that the stickers should focus on the operation of the corresponding LED indicator near the camera. The latter simply cannot work without activating this indicator. Also in the "System Settings" you can see which applications have access to the camera and, if necessary, restrict it.
If there is an urgent need to close the camera, such as the requirement of superiors, then Apple recommends using stickers with a thickness of not more than 0.1 mm (like a sheet of paper for a printer) that do not leave traces of glue. If the thickness of the cover is greater, then before closing the cover of the laptop, it must be removed.