Simple. Gold is an asset that is not used as currency but provides the holder with certain desired benefits and the asset can be liquidated if needed. Crypto is similar in that it prodives a financial vehicle that posesses certain properties. Im not saying they should all be thought of as digital gold but that lile gold, they provide value not only in thier price tag but in some inherent property that provides value to the user (this property varies wildly from crypto to crypto and is what makes each project distinct and unique.