If central banks want to make their own crypto digital currency, it must need permission from the local government and clarity on what functions and benefits are for and more stability in which direction
If any central bank is planning to create their own digital currency then you need to get the permission by the government and we need to expect more countries coming out with their own digital currencies but what we need to understand the success rate of these centralized cryptocurrencies depends upon how they are able to attract the common investors to hold or trade those currencies.