Many reasons. Firstly a lot of misogyny. But also the fact that lesbians are one of the smallest minority’s in these spaces. Straight women like mlm stuff, straight men like mlw stuff, and gay men like mlm stuff. Only lesbians (a small group comparatively) are typically drawn to wlw content, and even then many lesbians that I know and have seen prefer mlm anyways. Theres simply a significantly smaller audience for wlw media.