Any carpet in the bathroom ends up smelling like urine, especially with little boys in the house. Heck big boys too. At least with a rug you can through it in the washing machine. Carpet not so much. My grandmother had carpet in her bathroom. And those weird soft toilet seats that eventually cracked and would pinch your backside when you sat down. Wouldn’t recommend at all.
And I'm talking about a bath mat/rug. As clearly shown in the picture. I'm not a 100%, but I don't think they use the kind of glued on whole floor carpet anywhere outside the US because it's just crazy. Carpet elsewhere is just normal carpets/rugs, like sane people use.