It would be impossible to automate, as the source/tags would have to be correct.
It couldn’t be community managed, as that would lead to cliques and popularity contests and random usage (most users wouldn’t contribute to the system).
We’d need a lot more mods to properly sustain the feature as it involves checking not just every upload, but every tag and source edit.
There was an idea for “badges”, but most of them would have to be handed out by staff, and they’d be somewhat rare or purely stat based.
Right now, just no resources to implement anything like it.