You may need to get more specific about your definition of "ethical". For example, do you just mean "legal"? Or perhaps, consistent with current industry norms

You may need to get more specific about your definition of "ethical". For example, do you just mean "legal"? Or perhaps, consistent with current industry norms (which probably includes things you'd consider sleazy)? Or not doing anything that would cause offense to site owners (regardless of how unreasonable they may seem)? I do think it's laudible that you want to do good. Just pointing out that it's not a simple thing.