it is easy to prevent SEO abuse and SPAM: Don't let people's rankings affect the search results for anybody except them. That isn't to say that they have to ig

it is easy to prevent SEO abuse and SPAM: Don't let people's rankings affect the search results for anybody except them. That isn't to say that they have to ignore all the feedback they get. They can still analyze the feedback and use statistical analysis to help find places where their ranking algorithms are doing poorly. Once they discover problems, they can fix the ranking algorithms. Eventually, they might be able to spam-proof this feedback system to an extent where they could incorporate it directly into the ranking function. However, this isn't happening now. As far as I've heard, this is exactly the plan they have.