Not all central banks are quite so powerful as the Fed. I'm sure most of the 32 central banks in El Salvador right now are trying to figure out how to keep their country from collapsing as the US drives up inflation. Buying Bitcoin as a reserve asset is in the central banks' best interest if they want to survive the coming years at all. They would be able to issue a more stable paper currency against Bitcoin reserves. I'm not saying this is ideal but I don't think that these smaller centrtal banks are the same animal as the Fed.