I mean, if you think about it...it's one of the more popular animes out there right now, Universal sells a bunch of merch of it/it exists over at the Japan park, and it definitely plays into horror themes. Plus, with season 2 just recently finishing up, it wouldn't shock me. Idk about other generations, but I know it's very popular with Gen Z since all my friends talk about watching it. Demon Slayer makes a lot of sense to me.