I don't connect our TV to the internet for this reason, but I'm wonder if the PS4 I watch everything on does this. I hadn't heard it called out, but I wouldn't be surprised if tracking shows up at some point.
Sony definitely phones home to sends digital fingerprints of media you stream from local servers. I was streaming a movie on my PS3 from a local file server and about 5-15 minutes into the movie the audio cut out and a banner popped up about not having a proper license for the media
Was the movie you streamed Cinavia [1] copy-protected?
My Apple TV sometimes doesn't negotiate hdmi correctly and ends up without hdcp enabled, and it whines similarly to what you describe. If I switch inputs on the receiver it'll re-negotiate correctly and everything works again. It's annoying, but it's not necessarily caring specifically about the content you are watching.