Your washing machine could be sending 3.7 GB of data a day — LG washing machine owner disconnected his device from Wi-Fi after noticing excessive outgoing daily data traffic
Bought “smart” LG fridge, range and dishwasher a couple of years ago and never connected any of them, they function like they are supposed to, refrigerate, heat food and clean dirty dishes. No need to connect.
Fridge manual explained something like “in case of peak energy consumption your smart energy company can send a signal to your fridge to not use power”. What the heck do I need that for? To find spoiled food and mold growing in the fridge later on?
Some people have hourly electric pricing, in their case it's worth scheduling stuff based on predicted pricing. How that should is that you'd have a home server which controls your IoT stuff (so the gadgets themselves can be firewalled from the internet and controlled only by you) and then your server would fetch pricing data and pause stuff that doesn't need to run when prices are high and run stuff like washing when it's cheap
Turning your fridge off for an hour will not cause your food to spoil. You probably won't even notice a difference since they are well insulated. Turning off the compressor during the hour where most of everyone gets home and turns on their AC can have a noticeable effect on grid stability if done widely enough. I do this with a smart switch connected to my HA server instead of using cloud based connections, but the effect is the same and I've never had my food spoil because of it.