Gacha + waifus is definitely a huge hit. Especially because it also capture the female audience. Also cosplays on conventions do free advertising. (see Genshin Impact)
Never seen western studios release a game of this genre.
Never seen western studios release a game of this genre.
relying on organic advertising is even harder than making a good game. Some things are just in a snug little corner and never truly break out to that mainstream.