It's backed by mathematics instead of a country. That doesn't make it better or worse, just different, and diversity is generally what people want in their portfolio.
Uh, gold _is_ backed by chemistry. If gold were to change nearly any of its chemical properties, it would instantly lose its value. It is stable, generally non-reactive, non-toxic, lustrous, and of generally low abundance - all properties derived directly from its chemistry.
That is actually one of the strongest arguments, to my mind, for why some variant of a cryptocurrency will survive as a store of value. Gold kind of "organically" found its way into value almost precisely because it is backed by the physical laws of nature. Cryptocurrencies went up a level to be backed by the laws of mathematics.
