Incentivize better, more responsible vouching

The UI already shows a warning for people vouching. People vouching for submissions which are rejected for “Duplicate” and “Does not exist” are removed from the registry which leads to a loss of UBI.
So I would say that your proposal is in some form already implemented.

We also discussed of fines in addition (i.e. sum bad vouchers would need to pay before being re-accepted in the registry) which could increase its impact.