The key feature is that there’s a mechanism that limits supply. Other than that, value only exists because enough people agree that it has value. Fiat currency is exactly the same in this regard.
I think your questions indicate that you don’t have sufficient understanding of how “ordinary” money works. It’s just a promise of being able to exchange it for goods & services in the future, and its value hinges on people trusting that promise.
https://chatgpt.com/share/6874b9ed-0c0c-8000-9932-df4f9ba248b6