I would expect productivity to go lower over time with central bank money.
Simply because of the substitutions that come with it.
And the "indirect devaluation" of all other holders.
But that's not the evil part. It would be perfectly trackable what everyone is doing.
In general, this would allow add-ons on top. How much CO2 generates XXX over time.
Should this take a higher tax bracket?
And besides this,
Real abuse would be the real problem of freezing funds for questionable reasons.