I definitely find the physique of women who only train legs strange, which is definitely not the case with these three. If all three of them have legs that are much more muscular than their arms, it is a genetic quality of Brazilian women - even some women who have never been to a gym have extremely thick thighs, often combined with a thin waist and relatively delicate arms. Here in Brazil we are used to it and we don't think it's "disproportionate". We do think that sometimes European and North American women lack legs and butts.
I'm in Brazil and not a fan of this disproportionate look of most women here. It's more of a cultural thing than lack of genetics. Some of them look like two different women in one, it's just weird. But there are those here that aim for a more balanced physique, they make a huge difference when decide to.
They train their bodies too, they just have a typical brazilian woman's body, delicate but with naturally thick legs and a perky butt. A Brazilian woman, with exceptions, has to take a lot of anabolic steroids if she wants a body with more masculine proportions.