There is another issue here is well.

Slander.....

If you invent a song, and someone you don't like is using it against your purpose. They shouldn't do that. They need to respect your personal boundaries, and respect what you created.

They also need to give you acknowledgment for you creations, unless expressed by you otherwise.

If someone says they created something, and they didn't and it was you, and they stole your idea.

In that case, that is stealing. But that's entirely different to piracy!!!