Will Google/yahoo/bing destroy SEO ?

[dude xyx]

Google is an search engine. Their objective is to give their users better search result with accurate information. So they always try to filter out spam sites and duplicate content sites So those people who search can get quality result. Nothing wrong about that.

Webmasters always try to get their sites rank in Google result, their sites has good content or spam. Everyone try to use anything to get their sites ranked and Google want only quality sites to be rank. So they change their policies and algorithm time to time.