BL FOR ACTUALLY GAY PEOPLE

When do you know that a certain Author makes yaoi for the lgbtQ+ ,and not to straight females in general? I am not trying to be rudeee here ok? No shade. Its bc i see a lot of girls talking nonsense all the time in the comments section about a lot of cr*p (not gonna say what okurrr?) And sometimes i really feel like BL mangas are just to satisfy females "fetishes"?