Like I do with laptops, just snip wires (or pull out header/connector) to microphone and camera. Problem partly solved.

Fully solve it by disconnecting network cable/Wi-Fi so there's no internet.

For me a TV set only receives FTA signals and has connectors for local media/AV input. It ceases to be a TV set when it starts doing what my PCs and laptops do.

(Anonymity is the reason why FTA broadcasting is still so very important, by design it's only one-way — broadcaster to listener/viewer. Unfortunately smart TVs and the internet subvert anonymity by design.)