For whatever reason Warthunder attracts a lot of people that are total nerds over military hardware, especially on the historical side of things, including a lot of wereaboos. It also attracts people actually working in military positions, where a lot of the leaks come from, to my understanding. I remember a bunch of years ago there was a leak because a bunch of them were having an argument on the forums, and one of them was an engineer with access to blueprints.