The thing that differentiates things is the vendor. Vendor means that when you first install a game, google play asks the vendor i.e, dev ok! tell me what should i serve to the user? then at runtime itself, it checks how user downloaded it? was he redirected from ad? if yes give nsfw and if not give sfw, this is done internally on a google play server basis so it can't bwe edited they do this so their game remains popular while keeping themselves hidden from playstore.