"Adult content is a huge business and is one of the few entertainment industries to have withstood economic pressures which have led to sectors such as the music industry, witnessing a decline. On the internet, pornography has been one of the few success stories in terms of revenue generation. Pornography is increasingly becoming available on mobile around the world. Can you afford to ignore adult content?"
How long before search engines are urged, pressured, or ordered to remove search result listings that the government or other groups deem inappropriate under the political criteria of the moment?
In practice, of course -- as I've written many times -- effective censorship of the Internet is impossible. You can make access more difficult or more of a hassle, but in the end censorship efforts even for seemingly laudable goals -- will drive the materials of interest ever deeper underground into forms that make them even more difficult to track. That's just the way it is, like it or not.