I like the fact that you tied the Watson api and the Telegram api together in a simple app, but it's a bit far-fetched to claim that "building intelligent bots is not too hard" based on this example.
I'm not trying to be mean, but I think you just have an incorrect understanding of the term 'chatbot'. It's not really that ambiguous. See https://www.google.com/search?q=define%3Achatbot