This is because some have discovered that despite factory resetting the device, it appears that the original owners can still have access to images taken and recorded by the camera. This seems to be due to a pairing with an app called Wink that allows users to control their smart devices.
This means that despite it supposedly being brand new after being factory reset, its previous owners can still look in on it and see what’s going on. Safe to say that this is a huge privacy nightmare and at the moment, there doesn’t seem to be a fix for it, save for unplugging the device and keeping it offline until Google gets around to fixing it.
In a statement made to Business Insider, a Google spokesperson confirmed that the company will be looking into the issue and will issue a fix for it. “We were recently made aware of an issue affecting some Nest cameras that are connected to a third party partner via Works With Nest. We’re actively investigating it and working on a fix.”