Seriously? Do I need to explain why a song doesn’t enter the public domain when it is played on the radio?
At some point people are gonna have to accept this.
This sentence added nothing substantive to your comment, and made it rude; could you please be a bit more polite in the future?
Yours is a somewhat orthogonal point and one I don’t entirely disagree with.
On the opposite end of the spectrum might be a photographer's website containing a gallery of their sample work. The fact that the gallery is openly published doesn't represent a relinquishing of copyright over those images.