Surely all cryptocurrencies are memecoins. There's very little debt in these things, so that it isn't a source of value, and there are many popular systems, from Bitcoin to Ethereum, so isn't any that can be said to be somehow special.
Gold Standard, Government Protection, Debt, Government credit instruments.
But everything I read about currency tells me that its largely always just agreed upon make believe. The case with the Real absolutely confirmed that for me.