Make submitter of an idea anonymous after the idea is processed (in a DONE-state)

Due to the GDPR-regulation about data minimization, we (in the EU) are required to remove personal information, when it's not needed any longer.

When an idea in an ideas portal is processed and ended up in a DONE-state, it would make our life remarkably easier (and the platform legal to use), if the submitter was hidden or anonymous automatically.