It's not enough to simply have a IoT VLAN that you put all your IoT devices on. Because those devices can see one another. In this case, if the coffee machine can see what type of smart fridge and smart toaster you're using, they can sell that data.

I default to adding IoT devices to a 2.4g "Guest" network where they can't see each other. Exceptions are IoT devices that need to see their friends to do what I bought them for, or devices I want to integrate with HomeAssistant. In those cases I create a separate IoT device per IoT brand. Excessive but necessary.