http://www.pcgamer.com/hi-rez-president-explains-why-battlegrounds-name-was-chosen-for-paladins-new-mode/

Yesterday at Hi-Rez Expo 2018, free-to-play hero shooter Paladins: Champions of the Realm announced a new battle royale mode named Paladins: Battlegrounds. In the face of the rising trend, more games are adding similar modes to their makeup, however this one's name raised a few eyebrows—given how closely it reflects PUBG Corp's megahit PlayerUnknown's Battlegrounds. 

Now, Hi-Rez Studios president Stew Chisam has explained why he and his team opted for 'Battlegorunds' over, say, battle royale, or a similar appendage.