Fairness issues aside, why on earth would you connect your critical infrastructure (such as house controls, car controls) to an open Internet, and give the controlling keys to someone else!?

This “cloud infrastructure controlled by someone else” idea has to stop at some point. You gave you pictures to Apple/Google? You are asking for trouble. How? I don’t know and I can’t predict the future. But I will say that this is a critical infrastructure risk for a person or a company.