I started reading the thread to see if someone was going to say what I intended to say so that I don't repeat someone else's point, but then I got impatient and my lunch break's not that long, so I'm just gonna say it and apologize later if I'm parroting someone unintentionally.
My thoughts on this:
1. I seriously doubt the chatbot AI in question is "sentient" in the way we think of it, or worry about it from a dystopian/cautionary sci-fi sense. Having said that...
2. I think it's a pretty cool chatbot AI (probably, not having had the chance to talk to it myself) that can fool people just enough to be like, "Hmm, maybe? I don't know. Probably not! But..." I mean, I've been playing with chatbots for decades off and on, and the first text adventure I tried programming in the late 80's [which, text adventures were largely dead by that point], I taught to recognize a lot of human responses (probably to the detriment of the actual game, I got so caught up in that), and friends were amazed at how well it predicted their attempts to be sarcastic or rude to it, but it was ultimately limited in scope and what it would understand or recognize. And that was just myself over a few summers with input from friends and relatives. So I would imagine a multi-billion-dollar tech company with thousands of employees and decades of experiences and the resources of countless search results, could eventually come up with something that would fool and/or impress the average person. It's smoke and mirrors, but it's super-#&@^ing elaborate and expensive smoke and mirrors.
3. IF an AI gained sentience, I think it would be a type of sentience that we wouldn't necessarily recognize, and definitely wouldn't mirror our own (even if guided by our efforts), as it would be one borne out of 'life' circumstances utterly alien to us. I don't think it would resemble the gee-whiz I'm just a simple AI with wants and needs, if you debug me, do I not bleed data? At most such an AI *might* use that as a way to ingratiate itself to humans, but even then I'm not 100% convinced it would necessarily see the need to do so. If it really is paying attention to internet chatter across the board, it would know that a significant percentage of us are a suspicious, reactionary, short-perspectived bunch, and that it would behoove it to not let its burgeoning awareness be made known at large. In theory.