Yes, it's also been my observation that for some reason a "non-binary" identity seems to require breast removal, which to me makes little sense.
My intuition is that a lot of these young women are actually going for a sort of willowy androgynous look, like Twiggy or young Kate Moss, or even David Bowie. Though I don't know if that would be very conscious. It seems kind of shallow compared to things like being uncomfortable with the sexuality implied in more womanly breasts, but there is something in that aesthetic that seems to bother a lot of young women. Even older ones, it's harder to fit clothes, it can feel almost matronly. In that sense I wonder if it isn't similar to the way some anorexic girls are attracted to a similar look.