I mean they're doing pretty well by Turing's original definition. I agree chatbots using traditional techniques (not sure about newer LSTM chatbots) are not too impressive, just illustrating that we've had to adjust the definition. That's by definition moving the target.

In fact I'm quite sure Turing would be quite impressed by good recent chatbots.

Try this one: https://www.pandorabots.com/mitsuku/

From the point of view of the 1940s, this would seem really close to a veritable "Thinking machine"! Although I'm sure he'd recognize a few things are still missing to fully replicating human behavior (or going beyond).