It's not goalpost moving, you said "In a Ponzi scheme, you are told you can just buy the investment and sit back and wait for it to appreciate in value or dividends to be paid", this is something which can be 100% non-fraudulent, and thus not sufficient to define a Ponzi scheme.
I agree. "In a car, you can eat dinner" doesn't mean any place you can eat dinner is a car. I never claimed that was sufficient to define a Ponzi scheme, only that it was what distinguished a Ponzi scheme from a pyramid scheme.
And I don't know why you have to insist that a neutral instrument like bitcoin itself could become a Ponzi scheme just because what people do with it, unless the protocol itself is designed to help the creation of such a scheme.
It wouldn't be just the instrument itself. As I argued, numerous other components would be necessary, including prior investors using deception to lure future investors and including having no reasonable source of legitimate profits to be distributed to investors other than investments. (And, again, I don't personally believe those things are true of Bitcoin. But that's what you have to address to rebut the argument that Bitcoins are a Ponzi scheme.)
You keep changing your arguments and refusing to either respond to my arguments or agree with them. One last chance for me to keep my presumption that you are arguing in good faith:
1) Either agree with or rebut my argument that a Ponzi scheme does not need "operators" or that, to the extent it does, Bitcoin has them.
2) Either agree with or rebut my argument that Bitcoin is more like a Ponzi scheme than a pyramid scheme because there is no requirement that you recruit people to make money and no downline but instead the claim is more that you can just put money in, do nothing, and take money out. That is the key difference between a Ponzi scheme and a pyramid scheme.
(Of course, you are free to make new arguments or continue other ones. But you cannot simply ignore an argument I've made and move on to just something else. You must do me the courtesy of agreeing with or rebutting the arguments I've made as I've extended that same courtesy to you.)