It’s not just ovens and refrigerators that are getting wi-fi, often bundled with cameras that let you see your food. It’s also coffee makers, digital thermometers, crock pots and virtually any other small appliance you can imagine.
The mostly likely use of Wi-Fi in a plethora of basically dumb home devices (do refrigerators really need Wi-Fi too?) is so manufacturers can keep tabs on how often their devices are used, and how they are used. In some cases, the data might even be sold for marketing purposes – perhaps someone that makes a lot of coffee is a candidate for blood pressure medication?