This happens in other countries as well. I’ve been told to speak the local (non-English) language when visiting friends overseas when having a private conversation.
Generally, it seems to be nosy old people who are upset about not being able to eavesdrop
Most of the newer laptops I’ve picked up some have hardware switches, but they do have a physical shutter that can be flipped over the camera which IMO is better as I can visibly see the camera is blocked