When the government does something unpopular against its own people, they can easily quell protestors at scale and force the usage of CBDC adoption by closing ATM withdrawals [0] add savings limits [1] and can incentivise spending with an expiring date. [2]
Whilst many HNers were celebrating UPI as the payment rails from India, it is almost the same thing as FedNow and is planning to put their own CBDC on UPI called E-RUPI [3] taking all the same valid concerns that I have mentioned.