If half of your customers are women you may want enough women in your culture to make your product attractive to women. If you have other segments of your customers that are underrepresented among your developers, you may want to encourage that group to get into programming.
Of course, a free course is not supposed to be their whole education and training. It is supposed to be their welcome mat, their foot in the door. A lot of people need encouragement to get going. This course is such an encouragement.