https://www.gamespot.com/articles/pubg-vs-fortnite-is-epics-free-battle-royale-mode-/1100-6453768/

PlayerUnknown's Battlegrounds is the most popular game on Steam right now, so it will undoubtedly face copycats. However, when Epic Games released a Battle Royale mode for its survival shooter Fortnite, PUBG developer Bluehole responded negatively, saying it was "considering further action" against Epic--which also happens to be the company that licenses PUBG's engine.

"We've had an ongoing relationship with Epic Games throughout PUBG's development as they are the creators of UE4, the engine we licensed for the game," said Bluehole VP Chang Han Kim. "After listening to the growing feedback from our community and reviewing the gameplay for ourselves, we are concerned that Fortnite may be replicating the experience for which PUBG is known."