I was going to write buy Apple TV and never ever connect the actual TV to the internet, but:

- I am unsure whether modern TVs utilize ethernet over HDMI to connect to internet through Apple TV (I have no idea why Apple TV should allow this, but I don't trust Apple to not accidentally enable this)?

- I can only imagine nefarious five eyes reasons for why Apple released Apple TV that plays 4k60 exactly like the previous models, but now has 8 GB RAM, powerful machine learning CPU, and built-in microphones that are impossible to disable

So, apart from getting used prev gen Apple TV (and still having to trust company whose leader has to accept Trumps's lunch invite), I have no good advice.