Findings of a research show that the Nest camera is still operating even after it has been disabled through the mobile application. Device is the latest product of Nest that enables users to see live video of their homes or to be notified about unusual motion or sound. Even though Nest used 128-bit secure sockets layer (SSL) encryption, perfect forward secrecy and a 2,048-bit RSA key unique to each camera, but users might face new security risks. Lastly, this camera uses electricity constantly which is not an efficient practice in 21th century.”]
Source: https://securityaffairs.co/wordpress/42317/hacking/nest-camera-issue.html