This is why CBDC and UBI are such a perfect fit. UBI is the carrot for CBDC, and CBDC is the control on how UBI is used.
Even then, CBDC control is only effective until value is transferred to the underground market. e.g. receive CBDC, use CBDC to buy approved food, clothing, etc; then, trade approved purchases for underground market currency in order to spend on whatever. In short, Degens will find a way.
this is actually somewhat reassuring, but isn't CBDC use totally transparent to those controlling it?
Yes. It almost certainly would be designed to be totally transparent to those controlling it.