Probably a leftover from old code, I don't think this invoke usage of VIEW3D_OT_background_image_add was actually reachable anywhere from the UI, but managed to get it working from py, without increasing user count...
Probably a leftover from old code, I don't think this invoke usage of VIEW3D_OT_background_image_add was actually reachable anywhere from the UI, but managed to get it working from py, without increasing user count...