Why is Curvy not on the list of body types?

For women shaped like Kardashians, hourglasses, Iggy Azalea, and Instagram Model filters. These aren't considered "average" or else women wouldn't be trying to look like it through apps/filters or surgery. And these aren't considered "chubby" as that implies women who obviously don't work out and/or have a belly.

So why isn't curvy available as an option? Far toooo many of these anime deformed app filtered girls being listed as "average" or "athletic" despite their 40-10-50 frames because their only other option is "chubby".

I'm not expecting it to be added, I just want to know why it is purposefully not.