https://www.pcgamer.com/bethesda-sues-warner-for-ripping-off-fallout-shelter-in-its-westworld-game/

Warner Bros. released a mobile game based on HBO's Westworld series yesterday, which isn't something we'd normally pay much attention to. We are in this case, however, because the launch of the game was followed shortly by the launch of a lawsuit, filed by Bethesda, alleging that the game is "a blatant rip-off of Fallout Shelter," that's actually built on the same code. 

The suit, available via Polygon, alleges that Westworld features "the same or highly similar game design, art style, animations, features, and other gameplay elements as Fallout Shelter." But the similarities are more than skin deep. Both games were developed by Behaviour Interactive, and Bethesda claims that Warner hired Behaviour to develop the Westworld game specifically because it had made Fallout Shelter.