Not if the price ceiling were selectively enforced against only one type of radio station. In your analogy this would be the e-commerce company has to buy twinkies from their supplier at 8x the price everyone else pays by government mandate.
Separately, to your point about unfairness, I suspect that both radio and internet streaming prices are lower than what the market would set if the government didn't intervene.
I don't necessarily doubt it is more effective for certain things, like local events (although Pandora could move that direction I suppose). I'm just wondering why radio would be so much more effective. Is it because they have so many more ads per hour of play, and radio "personalities" to shill local stuff?