As I understand it, AI ethical principles relate to the development of a superintelligence. Talking about unethical usage of narrow AI is like talking about the unethical usage of any other tool - there is no significant difference.

The "true" AI ethical question is related to ensuring that the team that develops the AI is aware of AI alignment efforts and has a "security mindset" (meaning: don't just try stuff and repair the damage if something happens - ensure in advance, with mathematical proof, that a damaging thing won't happen). This is important because in a catastrophic superintelligent AI scenario, the damage is irreparable (e.g. all humanity dies in 12 hours).

For a good intro to these topics, Life 3.0 by Max Tegmark is a good resource. Superintelligence by Nick Bostrom as well.

For a shorter read, see this blog post: https://waitbutwhy.com/2015/01/artificial-intelligence-revol...

For general information about AI ethical principles, see FHI's website, they have publications there that you could also read: https://www.fhi.ox.ac.uk/governance-ai-program/