As a white woman in the tech industry, the entire pipeline is leaky. You're discouraged from studying engineering before you go into college. You're discouraged once you're in college. You get less money and fewer advancements once you're in industry. Dudes creep on you and condescend to you, assuming you're a diversity hire. Even encouraging people will push you into non-technical roles because you have "soft skills". Eventually you get sick of all the bullshit and you take one of those non-technical roles, or you just leave the industry altogether.
Even if you feed more people into one end of the woodchipper, very few will make it out the other end intact.