Disconnect it. But seriously, see if the router can block the requests.

I think the easiest way would be to set a firewall rule, don’t let it talk to the other devices on the network. Or maybe just put it in it’s own vlan entirely. Definitely could impact functionality though, especially casting I imagine.

It's rather frustrating I can't just buy a dumb tv. The smart bit about a tv is going to be obsolete a decade before the screen anyways. How much effort is plugging in a Chromecast or something?