I heard that some 2024 models refuse to go through the setup wizard without internet access. Not sure what happens if you disconnect it after setup though. But my Amazon Fire Stick already refuses to do anything without internet even though I could stream locally with vlc.
I wonder if this is a market specific thing, that is to say if it is turned on or off depending on which market you're in. For example I wonder if there are pertinent regulations applying in EU, if so I would expect it were turned off in EU.