Building even a mediocre search engine involves a gigantic index in >40 languages that is constantly refreshed, plus image and video indexes, porn, spam, malwar

Building even a mediocre search engine involves a gigantic index in >40 languages that is constantly refreshed, plus image and video indexes, porn, spam, malware filters, complex ranking, freshness, originality algorithms, constant quality analysis and continuous maintenance and improvements for the infrastructure. They are not transparent about breakdown of queries or details of their deals with Bing and Yandex. They try really hard to create an illusion that it is a real search engine, but seems like it is basically smoke and mirrors.