I guess it's keeping up with the times. Introducing CBDC is a way to bring money back to the Central Banks.

Government and traditional financial institutions already acknowledged the fact that money is flowing into cryptocurrencies but those who hold crypto are probably taking their sweet time to convert back to physical or digital fiat. This may have caused liquidity problems for banks since funds are now on personal wallet or exchanges and they no longer have access to depositor's money like they used to as a result. They also want people to trust CBDC more than stable coins.