Past NLP researcher chiming in here. Google Home and Alexa use pretty sophisticated speech to text software to decouple your voice from background noise, and th

Past NLP researcher chiming in here. Google Home and Alexa use pretty sophisticated speech to text software to decouple your voice from background noise, and then translate our speech to text, and then from text to program triggers that ie turn off your lights. It may sound trivial but the Home work so well it really is kind of magical. The Chatbot stuff is more questionable, especially the ones based on deep neural nets ( again I've published in this domain so I looked at it pretty closely ). Twitter/FB/Douyin/Google all use NLP to tune their feed or give you search results. Just to give you some examples...