To have those running as a security camera recording audio is legally perilous anyway. You’d have to inform car passengers or house guests that you have a microphone running if there’s any chance they might converse without you. The trouble you’d get into for surreptitious recording is a lot worse than a YouTube takedown.

And in the ambient music scenario the accidental recording of music isn’t a problem — it’s always been fine to record live music, radio, TV, etc. for your own enjoyment. It’s the non-accidental uploading to YouTube that’s the problem. Copyright doesn’t interfere with using it as a security camera, with or without audio.