Cloning was covered in a scifi episode once, story was pretty negative (they were needing to steal some DNA from the protagonists). All they needed to do was ask.
Bioethics is very serious, but techno-utopians don't take ethics seriously, if it challenges their patents, their IPO, their connection to military bio-warfare, their connection to the MIC (medical industrial complex).
I expect people have or will try human cloning, as a way to make more easily available, cheaper, organ transplants. This has been done in many fictions. Cloning of animals and plants have the difficulty that was mentioned by previous posters. The Irish potato famine comes to mind.