Many racing games are similar at their core. For instance, why aren't Turn 10 complaining about Assetto Corsa or Project CARS? They're all aiming to be racing simulators, with a variety of accurate tracks and cars, which range from road cars to open-wheel racers. Same thing goes for Dirt Rally and Sebastien Loeb Rally Evo, the two games share game most game modes and disciplines, they just run different graphics engines and physics engines. It's just something called competition. Nothing's stopping this new studio from creating a rival to Driveclub with an even better, scratch-built (therefore propriety of them, not Sony), game engine. Otherwise, how could Forza still be a thing? It's, at the core, the driving simulator of the Xbox.