Neat software, but I think this is less defensible than other ad blockers. With web ad blockers you protect against tracking, privacy violations and potentially malware and thus don't see "unacceptable ads". In contrast this seems to be about blocking ads just for the sake of blocking ads.
I'll often find myself turning the radio down to the second-lowest volume it goes, so I can turn it back up when there's actual music. Equally often I turn it down and then forget about it for the rest of the trip. Honestly, a trip in silence is sometimes preferable to one where I have to micro-manage the volume knob, let alone one where I have to listen to radio ads.