A step-by-step approach to CBDC

Why would anybody shift from UPI to CBDC? What are its advantages over UPI?

Last week, I got this mail from my bank:

Dear customer,

XXXX Bank is delighted to invite you to participate in the pilot of digital rupee (e-rupee), a new form of currency launched by the Reserve Bank of India. e-rupee is a legal tender, similar to sovereign paper currency, and is issued in a digital form by the Reserve Bank.

You are selected to be part of the Closed User Group (CUG) and get a glimpse of the future of digital currency in India. You can transact e-rupee through a digital wallet being offered by XXXX Bank. This e-rupee