I don't understand why this is such a hard problem to solve. I assume that every business that manages to farm content and SEO it up to the first page must be

I don't understand why this is such a hard problem to solve. I assume that every business that manages to farm content and SEO it up to the first page must be making a decent investment in time and resources to achieve this. It doesn't happen overnight. So wouldn't it be easy enough to maintain a blacklist or at least a de-value list that would bring the return below the investment? Shouldn't there be a streamlined process for assembling this blacklist? They must already be doing something along these lines and no doubt quite a bit more involved than what I'm describing here. Could they add in a crowdsourcing flag link next to all search results. This wouldn't blacklist anything automatically obviously but would assist in identifying which results should be investigated further? Why is it still an issue? Is it a legal problem? Can they be sued for maintaining a blacklist? I'm not trying to say I know better, so I must be missing something. Maybe someone can shed some light on my ignorance?