cny vs e-cny
Whether the US (or the UK) like it or not, the Chinese Yuan is a real reserve currency. The IMF ranks it 5th in foreign exchange reserves behind the US Dollar, Euro, Japanese Yen, and British Pound Sterling. (note that the chart is not in order and refers to it by its Chinese name, the Renminbi - CNY is its ISO designation)
https://data.imf.org/?sk=E6A5F467-C14B-4AA8-9F6D-5A09EC4E62A4
The digital yuan is not a Ponzi scheme, since it is backed by the Chinese government, (and is a surveillance mechanism within China). Its future, like those of the digital dollar and digital pound, is yet to be determined.