> In other words, if there is systemic sexism, then there exists a profit opportunity for entrepreneurs to buy-up typical companies and replace expensive, scarce male labor with cheaper, less-scarce female labor.
The trouble is that the difference starts earlier than that.
Say you buy a tech company with 90% male software developers, aiming to balance it out. Turns out qualified female software developers get paid the same amount, but there aren't as many women with computer science degrees or relevant experience.
You could go round up some lower-paid women with no qualifications and train them to be software developers, but you could also do the same thing with lower-paid individuals with no qualifications who are of any gender. The problem in both cases is that once they're qualified for the higher paid work, you have to pay the higher salary or they can quit and go work for someone who does.