Is it permissible to earn money from writing stories on a website that displays advertisements containing pictures of unveiled women? And is participating on this website considered assisting in the dissemination of these advertisements?

If the website is not specialized in publishing forbidden content, nor is it predominantly characterized by it, but rather some of it appears therein, then there is no harm in participating by publishing articles on it and taking payment for them. This is not considered forbidden assistance. However, it is preferable to participate in websites that are entirely free of objectionable content.