What DNMock said. That and He has lot of support from within Sony Entertainment. People call him an Sony Fanboy for good reason. There's reasons its an PS4/PC exclusive, i think Sony helped fund it somewhat as Sony does that sort of things and Sony has an history of buying out these studios inevitably. Look at what happened to Insominac Games : It's history is mostly making games for playstation and in the end, it was Sony who bought them. However, Sony is probably one of the more hands-off in terms of interference, who else would let some of those games like Sony Japan The Last Guardian go through that much development hell.
Mark Cerny is suppose to be friends with him and when he started his studio, he literally got inside access to Sony 1st Party Studios and its development teams, including its major engine development teams at Naughty Dog/Guerilla Games. That makes an huge difference having access to Sony engine development team. I don't think he paid much to have access to Guerilla Games (Killzone/Horizon Zero Dawn) Decima Engine.