Even with a mesh, devices still have to be authorised to get access.
Just don't do that.
The more difficult option is if they come with cellular modems built-in, thus bypassing any of your infrastructure (which needs authorisation). That of course is technically possible, tho probably commercially unacceptable (modems cost ~15 to 20 dollars in bulk which is significant at smart-tv scales, not counting the data cost).
More expensive IoT items like modern cars ship with factory activated cellular modem based tracking. Your options today are to buy older base model vehicles or learn to use a screwdriver and a soldering iron.
> Even with a mesh, devices still have to be authorised to get access. Just don't do that.
Nope, the whole point of Amazon Sidewalk is that it "just works." I don't think there's even a way to know what devices are connected, let alone any kind of authorization.
The more difficult option is if they come with cellular modems built-in, thus bypassing any of your infrastructure (which needs authorisation). That of course is technically possible, tho probably commercially unacceptable (modems cost ~15 to 20 dollars in bulk which is significant at smart-tv scales, not counting the data cost).