However, the massive bulk of the market ends up being targeted towards women. It's something where you'd need to actually look on shelves for, as there's a weird dynamic where in female-dominated markets or places, you have male "figurehead" things while the rest of the market is dominated by and caters to women.

I noticed this in Christian fiction ironically. You will see a big author like Ted Dekker doing his spiritual action adventure/fantasy/mild horror for a wide audience, but the huge bulk of the books are historical/amish/mystery romance aimed at women, to the point where no male alternatives exist. Even the small religious science fiction market is female dominated soft romantic sf.

In this case it's milking established demographics, as the religion itself has a mild demographics issue (not enough men.) But go look at a young adult shelf sometime; even superhero books feature women protagonists and are targeted to them now.

From personal experience, Rick Riordan's series had similar interest levels between girls and boys but later series (Hunger Games, House of Night, Fault in Our Stars) did skew towards girls. My reading also fell off as I got older so I'm sure I wasn't as in touch with what my peers were reading.