>>44518912It's more common in anything otaku centric. Gaming, Anime/Manga, Vtubers, many of the people working in the industry are doing so because they're fans of what they're making. You have married women like Sayori-sensei making NekoPara. Or Tsunako-sensei making the Neps. It's for otaku by otaku. Men and women alike will draw what they want and many love drawing cute girls, especially young ones. It's only a big deal in the west since mental illness festers there.
Hell you can have guro, beastiality doujin authors make it big with a legit romance series and everyone knows exactly what they did before.(774 with Nagatoro).
It's just a case of Japan knowing fiction isn't real and not caring if someone made R18 art before.