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.
Yes. However as others have already said odds are you don’t have the right devices. Still if you really work at it everything exists. Start by selecting one of the few TVs that support it, then get a good HDMI cable, make sure you have a video card that supports it, with drivers for the OS (you might have to write them yourself), then just setup networking. This would be an interesting hack, I’d love to see someone get it working and show their setup, but it is otherwise useless and will be a lot of work.
I think you misread OP’s intent.
After verifying that OP’s intent was met I gave a more fun answer that abused the letter of what was asked.