What? How is that supposed to help anything. It's not like you can physically disconnect the webcam without disassembling the panel.

The crazy part is you don't even know if it's still recording with the entire laptop off. Could it not, in theory, draw power off the main battery independent of the system being on? It certainly should be able to while in sleep mode.

Before we shrinked transistors to a mere atoms wide their main purpose was in switching power.

And no, it's not connected to the main battery, because presumably it runs on 3.3V and maybe even some more exotic voltages for the image sensor. That needs to be regulated.