There is a little LED that lights up when they open. The door latch is controlled via software and so is the light, though I would assume in the case of power failure they'd unlock for fire safety reasons.
I think Apple's building security architect should have a conversation with their camera security architect.
A door without a latch does not prevent an unauthorized person from trespassing. A camera without a cover does not prevent an unauthorized person from trespassing.
Apples webcams are broken by design.
Other companies fixed theirs years ago: https://www.youtube.com/watch?v=37NFVGLX3vw