OP - there are some lesbian women who seem to like that 'look' that you describe.
Also many stereotypical 'butch' lesbians who have a distinct 'look' which seems to emulate masculinity. I have several 'butch' lesbian friends who have their hair cut in barbers and wear stereotypically male clothes. Not just jeans, T shirts etc but clothes from mens shops, wearing suits including waistcoats at formal functions for example.
They certainly are conforming to a 'look' but are not at all interested in the male gaze. And their 'look' is not a 'look' that is appreciated by men.
So clearly adopting a 'look' as a woman is not necessarily for the benefit of men. The background, culture, sexuality and 'look' of many societal groups plays a part.
There are far more heterosexual women NOT adopting the 'look' that you describe. As women in a westernised society we're all subject to societal and media influence.
Given that, your OP should perhaps say 'why aren't more women doing this?' as it's such a tiny number of women who are. The majority of women just aren't adopting this look.
So why is that? If we're all so very influenced by pornography and the sexualised 'look' involving cosmetic enhancements that appear to be appealing to a certain type of men; why aren't we seeing swathes of these women everywhere?
Because we're not. Most of the examples on this thread are indeed - porn stars or 'celebrities' whose career is based on their appearance rather than talent or skills.
I'm certainly not seeing women with the 'porn star' look in my every day life.