Q: 1. Ans: No.... A used AI to write his own articles. He did not copy another person’s work.
Q: 2. Ans: Yes..... Any unique name (including your username) can be used as a brand if you create it and use it for business.
Q: 3. Ans: Yes...... C copied B’s lyrics, changed only the music style, and used it. Changing genre does not remove plagiarism. The words still belong to B.
Q: 4. Ans: Yes, possibly. Bible verses are public, but A’s explanation and teaching style are his own words. If B copied A’s explanation and posted it as an article without credit, that is plagiarism.