Why do we need ?
They can also program other things into it, like only allowing it to be spent at certain shops, websites or jurisdictions, and not at others.
They could link it to: your credit score, your health pass, digital ID and other social scores.
They can program any restrictions they see fit, based on your specific score in one area, or on your 'overall score', or on what they deem the 'economy' needs.
In addition, they will be able to surveil every single thing you do with your money
We don't know who's using a $100 bill today and we don't know who's using a 1,000 peso bill today. The key difference with the CBDC is the central bank will have absolute control on the rules and regulations that will determine the use of that expression of central bank liability, and also we will have the technology to enforce that.
~Agustin Carstens
GM, BIS - Bank for International Settlements
Note: Saying "that expression of central bank liability" implies that your value, your life force, stored as money, is actually 'owned' by the central bank.