It's not like it's impossible to combat search engine spam. The by far most effective tool is to just go after affiliate links and ad-heavy websites. Penalize

It's not like it's impossible to combat search engine spam. The by far most effective tool is to just go after affiliate links and ad-heavy websites. Penalize those websites and 99% of the search engine spam vanishes. Though as noted, this is not in Google's economic interest to do.