"cash in the bank" is an oxymoron. But by "cash" you mean any form of fiat, ok. So then your definition of "useful" = "accepted as payment in fiat only establi

"cash in the bank" is an oxymoron. But by "cash" you mean any form of fiat, ok. So then your definition of "useful" = "accepted as payment in fiat only establishments". By definition, these establishments will only accept fiat. So you are just defining "useful" = "fiat". Sure, by that definition only fiat is "useful". Definitions like that don't bring any new information. A better definition is "X is useful if I can convert X into a burrito". You can do that with DOGE or any crypto, anywhere Visa is accepted (for example with Lemon cash). You can also do that without Visa, it just requires more work: first exchange your crypto in a P2P network, then pay burrito