Honestly, the question in this case then becomes “how will anyone be able to enforce it?”
ISPs can be compelled to share name/address information of anyone involved in publishing licensed material through the courts. Then they’ll summon you to stop or pay a fairly hefty fine.
You’d have to first establish that the person under the IP is actually sharing copyrighted material. This is easy to track on something like BitTorrent, but virtually impossible through a regular website. You’d have to have someone pretending to be your friend, getting access to your song and then filing a complaint.
They would be able to sue the webhost in order to retrieve basically all the data if they have strong and reasonable suspicions that the website is hosting copyrighted material.
This really isn’t as foolproof in legal terms unfortunately. With torrent websites there’s still some ambiguity as the website doesn’t host the copyrighted material, just the torrent files. But here the website itself is liable, painting a massive legal target on their backs.
