I am not a crypto "maximalist" (a word I just learned from reading a comment to your article). I guess I can be described as a crypto "minimalist".
Based on my actual real life experience: for the minimal things or rather "uses" that I have made of cryptocurrency ... let me just say ... it's working for me!
It has helped me pay off debt, donate to charitable works, and help needy friends. Those are practical applications or "use cases" for crypto. If I can do that and crypto really is a ponzi scheme, then I can only imagine what I would be able to if it's LEGIT!!