circumventing Google

please i have a question , as we all know that putting pictures or names of famous personalitties is Forbidden in google policy , but i saw many application in google play use those keywords and pictures , how they do that , i tried that once but they didn't accept my app :/ , would you do me this favour and explain to me how they keywords like niki mnaj or justin bieber in the title and discription of those apps without bieng afraid of copyright