First, LLMs do not reliably cite works. They are not looking things up in a database and repeating them. I think this false idea occurs a lot in people who don't understand what LLMs are or how they work.

Second, royalties are not required to cite a source.

Can you imagine how disastrous it would be to everything from news reporting to scientific publishing if that was the case?

... LLMs cannot reliably provide citations. If you ask for citations, and the model did not use a web search tool, then whatever "citations" you receive are unreliable. Please do not trust these models to be honest. Just because they can discuss a topic doesn't mean they "know" where the knowledge came from in the same way that you don't need to have studied physics to catch a ball.