Korea's biggest search engine(www.naver.com) is basically like this. they created a walled garden that gives you practically everything. These portal type sites

Korea's biggest search engine(www.naver.com) is basically like this. they created a walled garden that gives you practically everything. These portal type sites disincentivize individual sites from creating contents, because the search engine directs the traffic into their own services(Q&A, blog, etc.).