I am unsure if this is the right community but here it goes.

I want to buy a smart TV and I will plug a HDMI device into it. I want to stream my games and movies to the TV via moonlight/jellyfin. I heard about ACR and how it can be used to recognize content running on our TV which will be then sold off to advertisement companies/data brokers.

Say I have isolated the traffic of the TV (the OS of the TV specifically) to a separate VLAN. But the connected HDMI device is connected to the internet. Can the TV use this network to effectively “phone home”? Do HDMI devices have this capability?

PS: I know modern HDMI dongles can also share data but I at least have the option to change the device/use a mini PC.

Edit: There might be a misunderstanding. I don’t want the TV to communicate via HDMI. I want to know if it’s possible and what should I do so that I can prevent this form of communication. However, it seems that this protocol is incredibly rare so I should be fine. However, some TVs can attempt to connect to open WiFi, so it would be wise to just yank the WiFi chip from inside the TV.