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I let my TV on wifi, but block internet access at the router. Things like Airplay and Chromecast still work great, but no ads/tracking/etc.

Is that tied to the port or the MAC because the device can just change addresses and you won't know.

You would know if your device starts updating. And if it changes mac to get around the block then it goes in the trash.

OpenWrt, make a wifi network only for those nasty spying devices, printers, tvs etc