They do, but you have to be initiated into the secret fujoshi(danshi) cult organisation. You do it by sacrificing a virgin on a fool moon while reciting the right spells.
lmao it just so happens that that subforum is dominated and frequented by romance readers, it’s become a place to share spoilers or novel excerpts from untranslated kr romance novels
People who share spoilers are the people who are interested in sharing spoilers. The more popular a given genre is, the more likely it is to find someone interested in sharing spoilers. But in all honesty... It depends primarily on luck. This is not the kind of thing with a real explanation for. Someone willing to share spoilers will share spoilers. Finding that person depends on your luck. As simple as that.