I can't find any references right now, but someone once mentioned TVs shipping with SIM cards embedded so that they could collect telemetry even if you didn't connect it to your network.

Even if it isn't/hasn't happened, there's nothing to stop someone like Samsung sticking cellular modems in their TVs to work around you doing this.

If we think about it like Air-Tags too, popular enough product, it'll just connect to one of your neighbour's TV's which _is_ online.

I remember years ago, Vodafone gave me a "free" femtocell because signal in my home was poor. They neglected to mention the fact it broadcast a public cellular signal which allowed other Vodafone customers to use _my_ internet bandwidth.