I'm not claiming that any particular chatbot has an equivalent experience, I'm claiming there is no basis beyond its behaviour that it does not.

With the duplicate mother problem, if you cannot tell then there is no reason to believe that it is not a being of equivalent nature. That is not the same as identity, for a layman approach to that viewpoint, see Star Trek: TNG, Season 6, Episode 24. A duplicate Will Riker is created but is still a distinct entity (and one might argue, more original since has been transported one fewer times). Acting the same as is not the same as being the same entity. Nevertheless it has no bearing on whether the duplicate is a valid entity in its own right.

You feel like I'm not living in the real world, but I am the one asking what basis we have for knowing things. You are relying on the presumption that the world reflects what you believe it to be. Epistemology is all about idetifying exactly how much we know about the world.

Ok you can have your radically skeptic hard materialist rhetoric. I just don’t take it seriously, and I don’t think you do either. It’s like those people who insist there is no free will and yet go about their day clearly making choices and exercising their free will. If you want to say technically everyone might as well be a philosophical zombie just reacting to things and your internal subjective experience is an illusory phenomenon, fine you can say that as much as you want. In turn I’ll just give up here because you don’t even have a mind that could be changed. I can sit here and claim you’re the equivalent of a void that repeats radically skeptic lines at me. Maybe a sophisticated chatbot or program. Or maybe you’re actually a hallucination since I can’t prove anything really exists outside of my sense. In which case I’m really wasting my time here.