I think the I in IoT is really for Internet, so I am not sure if it counts if it is local only.
I would love to have a connected home that did not require _any_ external connectivity or web accounts. Why did I need to login with my Google account and enable location services to set up a Chromecast Audio?
Listening to a song in the forest is free, listening to it in a bustling street costs 10¢ per play because you're performing it to people walking by