They are just better at marketing their female heroes to womem too.
I have yet to see a normie female be into a Marvel heroine, it's mostly Wonder Woman, Supergirl, and Batgirl. Black Widow is usually just worn as a slutty costume and even then most women prefer slutty iron man or slutty Thor, heck even slutty Cap.
Heck DC has Superhero girls and that alone won them over the little girl audience along with the Supergirl show they also have more magical girl type characters than Marvel and they use them.
Marvel meanwhile has been giving the spotlight to their tacticool spy female characters in leather (which we have enough of) and Captain Dyke will be getting a movie but those aren't really appealing to normie women like Supergirl or Wonder Woman.
Heck Wasp is probably a character that women and girls would like since she has the pixie thing going on but who knows how cute the movie will make her (however she can be pretty adorable and spunky in cartoons).
If Marvel got Kamala, Wasp, Sif, Hellcat, Singularity, Silk, Songbird or any female hero with powers or cute/feminine look they would get more attention from women and girls.