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This would not be without precedent. Some Samsung TVs already refuse to exit setup mode if they can't connect to the Internet after initial power-on to geo-lookup their IP to make sure that they're being used in the country they're sold for.
The best solution for streaming is a low-end PC with hardware video decoding and the ability to run Ublock Origin.
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Edit: I see from other comments that Samsung TVs already go into degraded functionality mode if they can't connect to their ad servers, and already serve some ads from endpoints used for necessary functionality.