“There’s not always a clear cause for the freelance gender pay gap. But in general, the fact that women tend to charge lower freelance rates than men in certain technical professions like consulting, engineering, and legal work could be a sign of other systemic and cultural biases against women’s labor and talent.”

https://www.fool.com/the-ascent/small-business/articles/the-gender-pay-gap-is-even-bigger-for-freelancers-new-survey-shows/