Category Theory is a branch of mathematics. It’s the purest one since it’s all about abstraction. Well, it should not come as a surprise since many people think that math preexists human intelligence and it lives in the divine realm of ideas. So, if for any reason some particular resistant virus wiped the human race from the face of the earth, euclidean triangles just to say, would be always there to poke their angles into some other alien’s eyes. Math is innate, the universe is built on its order.