CreatorOfTheVoid I imagine there are various reasons ranging from how male characters are written to escapism to plain eye candy (for manga/shows). I've seen things from just wanting a partial break from misogyny and comparison to a FL to reading about twice the hot guys as justification.
Also, there's always the bit about the yaoi/shounen ai/BL genre's origins in Japan for women since I'm pretty sure it's a shoujo sub-genre, whereas bara appeals more to a gay/bi male demographic. I doubt I could explain that history particularly well, but that's a bit of context.
My personal reason for liking it is that I'm part of the LGBT+ community, so the stories hit closer to home without being too close to home in a sense (lacking some of the heavier social issues while still not having a straight couple as the leads). I like GL as well and write both BL and GL, but BL is quite a bit easier to find due to its popularity and has more high-quality works due to the sheer quantity of stories being put out (compared to literally any other LGBT+ content).
Anyway, I guess this also somewhat answers the main topic of the thread; there are plenty of reasons why women like it a lot, and since Webnovel files it under the FL category, it gets a lot more female readers for that reason, too.