This feature has been requested before, but the last request was marked as answered when the data management feature was added to Forms. The problem is that drafts were not addressed by that feature and this is still needed.
There needs to be an option for a Forms Administrator to manage saved drafts, saved either by licensed users or public.
Drafts for licensed users need to be managed because of employee turnover. When employees no longer use Forms because they have either left the company or have taken another position that does not utilize Forms, those drafts stay in the database.
Drafts for Public users need to be managed for the sake of keeping the database cleaned up. The new Forms Public Portal File Cleanup Tool allows for this, but it should really be baked into the product itself as part of the data management features instead of having to run a separate tool.
Any data that cannot be managed by a Forms Administrator is a potential security risk if there is a security breach. The organization can also be held accountable for information that is not following retention policies if discovered as well.