Because there is not such a thing like $0/month for radio, as you are forced to hear ads, and the advertisers pay for it, and you are forced the songs you hear,

Because there is not such a thing like $0/month for radio, as you are forced to hear ads, and the advertisers pay for it, and you are forced the songs you hear, witch some people paying for controlling it. Yes, in the old days some companies controlled which music was heard and which not, and those gatekeepers were not as cheap as you thing. Definitively not 0$/month.