Women's magazines historically focused on women as housewives. but the feminism of the late 1960s resulted in hundreds of feminist publications. many of them didn't last long, primarily because

Not precisely sure, but it was going against social norms, which generally doesn't fair well, and they would've given more power to women, angering men, which wouldn't usually be that big of a problem except for the fact that most, if not all, companies were run by men
tl;dr: probably bc men didn't like it