Changing default images to screenshots

It appears someone, or numerous people, are changing a ton of games' default images to random screenshots.  It's getting ridiculous.  Not only are they changing them, but they're flat out deleting box arts to do it.  I understand that the idea eventually was to have logos and not specifically a box art for a specific system as the default, but deleting box arts and replacing the default with a screenshot is absurd.

Does anyone know who is doing this?  If so, please ask them to stop.  It's taking a lot of work to try and repair this.

No I think there was some sort of huge deletion of images from the database. I don't know if it was accidental, or if it was because they were copyrighted, but a bunch of games images got deleted.