I think the problem is that we all expect to get perfect results. We want automated systems to identify and remove unimportant useless things. But how will those systems get to know that?

We can't build another AI black box to try and do that. There is a option in search to report spam or improve search results.

Out of our laziness and expecting getting everything perfect, sometimes collectively working and reporting bad content-copying websites, etc. would be collectively useful for all.

Search had gotten so good that we probably expected to get perfect results everytime. Untill bad guys started to game it. I beleive it's more of cat and mouse game, and where all users collectively should help and mark as spam.