I hear you but how is this different from someone on Verizon being able to get a call from someone on AT&T? I don’t have to opt in to allow that. It’s two networks talking to each other to connect people.

I get your example but I think it's incorrect. I get a phone to join a network of phones, regardless of provider. Not a network of fridges (that can make calls). If I want to connect to a network of fridges, I actively do so. Nobody picks my phone and connect it to the fridges of the neighborhood.