Because they think they don't need to show up and tell the world that they are investing in crypto despite their gender.
In fact, social media influencers are more influential than these legit investors as we see. Many people believe these fake investors than those who are officially investing in cryptocurrencies. Because it was not the name or gender, what makes people embrace crypto is their interest and the way they understand how this works. Once they feel confident, with no doubts they will get into it and start. Building trust can't be made too easily or too fast which is why the adaption happens slowly, not an instant.