Perhaps needles could be seen as violent or painful. Scope of practice: knowing when it's time to tell someone to see another kind of doctor. I'd say ethical issues involving acupuncturists are the same as any other medical field, like chiropractors, nurses, medical doctors, physical therapist, psychologist, etc.

I think one thing all medical practitioners face is maintaining proper, ethical, professional boundaries with patients, while remaining "accessible" so that patients are comfortable talking about their health. They don't charge enough for the therapy? I don't understand your question. How can you talk about ethics and acupuncture in the same sentence?