Is it possible to filter spam sites in a search engine?

A topic has appeared on Google.ru that you can block a site in the results of search results . And you can block the site for such and such requests. Cool, is not it? Now you can block zadolbavshie spam sites for requests such as "download something." But this is something that needs to be done manually. So, what do you think, is it possible to make ready-made filters?



That is, a filter is compiled by many people, which is then simply inserted once into your Google account and you are spared forever from the idiocy of the issue.



If you go a little further, it would be cool in the settings to put that requests on such and such topics should be sought only on such a list of sites, which I asked manually or downloaded from an authoritative source.

')

Can anyone tell how technically it is difficult to do?