Apart from visiting the creator and physically handing them a wad of cash, you can't. There is no way at all for you as a consumer to ensure the creators are fairly paid. Simply put, the people you're paying for access to the content take most of the money and the creators get next to none.

Why do you think it's better for studios and labels to be allowed to extort artists this way?

The artist isn't getting fair pay in any situation, so why would you want to make things worse for everyone by continuing to encourage this rent-seeking behavior?