If you are playing music to yourself, and someone films you - you are not infringing - the person filming and uploading is - possibly, though that's more questionable.
I imagine it's hard to build a case against the guy blasting his car radio without a recording, and the affected people aren't particularly unhappy with it.
If copyright was more like trademarks, and they had to protect it to keep it, you'd see more cases of people playing their music too loud.
We'll see the same happen with streaming services as smart TVs get popular. You'll have to pay per viewer as licenses change
You are not infringing on anything by playing music to yourself, and it's not a matter of cases being failed to pursued, it's straight up legal to do so in every sense.
If there is some random person filming you - then they are infringing - not you.
If you are playing music to yourself, and someone films you - you are not infringing - the person filming and uploading is - possibly, though that's more questionable.