I don't think it's easy to copy. I can understand that the search market is ad driven. But they have put ads in everything now. Why does gmail have ads? It's no

I don't think it's easy to copy. I can understand that the search market is ad driven. But they have put ads in everything now. Why does gmail have ads? It's not easily copyable and people will take years to build a decent gmail competitor. And good products that didn't have ads like google reader get shutdown :/