> Can you give an example of non crypto speculative investments which are not expected to produce revenues?
How about any commodity or foreign currency? Gold, oil, etc.
> That’s how 100% of business promise to eventually provide returns.
Exactly. Since Bitcoin obviously isn't a business, it couldn't be a Ponzi scheme (because investors in Bitcoin aren't being mislead into believing that the returns are coming from a business activity).
> To make the limit argument: if bitcoin was run by a single person selling coins and claiming their value would go up because of network value, but this claim was not true, this would be a ponzi correct? Assuming the proferred proof was reported coin value appreciation to date. (I.e. the returns)
No, that couldn't be a Ponzi scheme because the person isn't lying about the origin of the returns. They really do come from other investors. That might be considered a pyramid scheme, though.