When Samsung Electronics remotely disabled the last of its flawed Galaxy Note 7 smartphones last month, it further blurred the lines between who ultimately controls your phone, computer, car or appliance — you, or the companies that make it work?

Industry executives and analysts say companies are exerting greater remote control over their devices — changing how and whether they work, removing or adding software and content, or collecting personal data from them — not always with the user's permission or best interests at heart.

The Samsung case "is exactly an example of how devices ... are no longer objects we own, but rather services we've subscribed to and which can be revoked at a moment's notice," said Stefano Zanero, an Italian computer security expert.