All I know about special privileges idols have received, was G-Dragon was sick or something like that, and during his recovery he got his own special room separate from anyone else in the infirmary. I remember him getting criticism for it, and the people supporting him arguing that idols are popular in the SK military and maybe they separated him to give him privacy. It is plausible that's why, however, I think it's more likely that he got a special room cause he's famous, probably even gave them money to give him that.