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.

Recording audio of passengers and house guests is absolutely fine in most states. I had a dash cam recording audio the entire time I was driving rideshare, many drivers do.

And it's not legal to bypass copy protection post DMCA for recording. So in most cases it's not legal to make recordings

If you didn’t post prominent signage in your car about the recording, you were breaking the law. Uber rolled out audio recording in Latin America but had to leave the United States out until they could be sure they’d fully satisfied the requirement to inform passengers. It’s not a small issue. See https://www.washingtonpost.com/technology/2019/11/20/uber-pl...