IoT is an interesting topic. I like your example of the smart fridge. It could also lock up at a certain time in the night to prevent midnight snacking :)
IoT is everywhere. It is now at a grocery store nearby. There is a very long aisle for frozen products and the lights remain off until you walk by. As you approach the light comes on, saving energy. I have also been to places where music starts playing only when you are near. IoT possibilities are endless and nice correlation with Steemit you made.