Because more women like BL rather than GL.
It comes from the fact that women can be in a story that doesn't put a spotlight on them if that makes sense.
From what I heard:
BL offers a safe, often male-centric fantasy for straight female viewers, tapping into established tropes, whereas GL narratives, though vital for queer women, face systemic challenges in mainstream acceptance and production, despite recent booms.
Though some theories suggest internalized misogyny or cultural comfort with male-focused narratives makes BL more appealing to women than centering women's love stories. (According to Google)
But in essence, BL's broader appeal stems from its massive female heterosexual audience simply seeking romantic male-male narratives, while GL's focus on authentic lesbian narratives caters to a smaller but growing audience, carving out its own significant space in queer media.
Becaise most romance readers are girls.
BL readers usually consist of gay men, straight girls and lesbians.
Meanwhile, GL is mostly only read by just lesbians. Gay men are not as interest in girls in relationships. Straight girls mostly prefer BL bc they're more interested in guys. In general, a lot of Lesbians and queer girls like reading BL despite not being into men.
It’s cause people love reading weird toxic shit and that is more the case in bl aka men and I think straight girl especially find reading gl just boring and not spicy enough and I think straight men usually don’t read smut they rather watch it aka mainstream porn rather than reading gl so the only true audience are lesbians who are genuinely interested in reading gl rather for only smut purposes like staright women and men and gay men usually don’t give ahhhh f about lesbian since their media is more dominant and cause women duhhhhh imtahts just my opinion

I've always wondered why?