Nobody prevents government(s) from creating a search engine. Actually nobody stops anyone from creating a search engine. Also nobody stops anybody from using another search engine. The internet is the most level playing field and is more competitive than any other industry. Nowhere else is it as easy to create something new as a business and to switch services as a customer. If anything it's the customers fault and by extension a lack of education. So if you want to blame government then blame it for keeping its people dumb. And there you actually have a point.