The power of chat bots is in marketing. They compete with email marketing as a more responsive medium. This is because platforms like Messenger allow much greater interaction from the user than email. Most think of chat bots as a textual experience, but you can actually build entire UIs with Messenger that include images and buttons. In a way, it can be thought of as less frictional minimalistic website via chat. Eventually you will be able to buy things directly in chat, closing the loop entirely.